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What is your largest coil for gold jewellery on beaches? What are your settings and why; mineralization of beach and ground balance settings etc? On a beach when you try to ground balance and there is no change of tone through the whole turn of pot', with a TDI SL or BeachHunter, where do you set the GB? Bearing in mind, that received wisdom says that TDI SL/HeadHunter is deeper when in GB on. So far, a Detech 18"x12" Mono is deepest in my South Wales beaches in UK. I'm including the BeachHunter as I know that some have modified them to plug in other search coils.

Hi Everyone. Could you please help me with this problem, I have been looking for a small coil option for my Beachhunter tdi, I have tried to purchase an Oz 7.5” mono single field but can not find one anywhere, does anyone know if and where I could find a similar coil that does not float and is waterproof please, also does anyone know if I could fit my Garrett infinium LS 8” mono and would it work. Thanks in advance.

I have an opportunity to buy an original Whites TDI but am wondering if it would compare to newer machines. I know its an old box version, but really interested in how it would setup and perform next to the newer designs. Anybody with some experience out there??

Does anyone have a copy of a circuit board diagram or a have a circuit board replacement for a TDI Beach Hunter? Does anyone repair Whites detectors? My control box leaked while water hunting in Fort Lauderdale and no longer works. It fried some components but I'm hoping it can be repaired. Thanks David

From the project I and others worked on. George.

After 2 shoulder surgeries, I am now ready to sell my heavier metal detector. I have a Whites TDI Pro with 6x10 digger, Dual Field Mono, Standard 12" with 3 batteries in a hard case. Suggestions on pricing would be welcome.

Is it please possible for an identification of what these two coils are? I have two Whites TDI Sls. One is a black box, the other is a tan coloured box. I have two coils, one with a TDI label, the other without label. The one without label has a cable 15” longer than one with label. Because of different cable lengths I tried to weigh the coils without the cables. No coil protectors on either. TDI label = 514gms, without label = 449gms. I’m guessing that the one with label is a Dual Field? But, what is the non labelled one? Both coils have the Whites logo to the right of cable entry to housing. No printing on TDI labelled coil cable. On non labelled one, just where cable goes in to housing is printed in white WHITES ELEC. The rest of the word is inside flexible covering possibly? I look forward to youtr thoughts. Regards,Rog

I had an SL a few years back and regretted selling it so I bought another. The detector came with two mono coils. My question is what would be the best coil to run at beach with lots of black sand? Thanks for any and all the help. HH

I know there were a few greats in this field a while back Reg being one of them (RIP). But im looking for any info in the whites TDI mods and mabye some instructions. I have a big box I know a bit about the batery but more information would be appreciated. I really would like the stability mod or any others that you could give me. Thanks

Osc

Today I sold a Whites TDI pro to a customer, we set it up and turned it on with the stock coil and did a few air tests. He heard that Minelab coils would work and other PI series coils. I suggested we try some Detech coils with the following results. The new 14in Mono Spiral wound ran quieter and air tested a little deeper on coins than the stock dual field. The little 6in Detech mono was a surprise as it hard and loud on targets for its size. When the weather gets better we are going to try a variety of the Detech coils and see which are worth having for the TDI, outdoors with more realistic buried targets. I`ll post what we find out.

Hello, I'm new to this site, so bear with me if this question has been beat to death. I have a TDI Beach Hunter and I want to upgrade the battery pack, since the Whites packs are more or less extinct now. I was hoping to use the 3.7 V batteries (X3), but with how many mAh? I want to find one of these as well (see picture). Thank you very much! and happy hunting!

In the UK there are about half a dozen or so major retailers dealing in new and second hand metal detecting equipment so finding some items here are very difficult or impossible to find. There are no gold fields, so PI defectors are at a minimum and restricted to a few that work on beaches and do not cost the earth; for example the Cscope CS4PI is popular. I have seen 2 original Eric Fosters in use on beaches too; a rare event these days. A few used less expensive Whites PIs occur for sale from time to time on Ebay or Facebook. Previously I have bought new from the USA and have had to put up with and accept massive import duties and VAT on top of carriage costs. Wanting to acquire different coils for the Whites TDI SL I am looking to have help please with suggestions of retail outlets possibly in USA, Australia or less likely Europe. I am sorry, this is already long winded. I have only just joined the site but been a lurker for years and think its a brilliant site and have gained much knowledge from it. So, as I cannot use the classifieds yet, my only option today is to ask for suggestions of shops/stores that may have for sale a coil that will suit detecting on our UK beaches; there is no mineralisation to cause concern. From what I have gleaned, maybe one of these will be an alternative for the standard 12” Dual Field and maybe be a bit better? I do not mind new or second hand as some are I think out of production. They are not in desirability order, but I do not mind comments too in regards a no no or yes yes. Digger 14”x8” Jimmy Scierra by Miner John or Dan Geyer version. Razorback Beach Hog/Longreach. Detech 15”x10” Mono. Nuggeteer 18”x6” Minelab mono series. Jimmy Scierra T-Foot 5.5”x18”. Nugget Finder 14”x9” or 14”x7”. Ground coverage has a part to play as some of my local beaches are 7 to 9 miles long and shallow, so the tide can go out from dunes on a big tide a mile or more. Lots of beaches from top to low are a quarter mile plus on average. Thanks in great anticipation. And I do not mind at all receiving PMs. Thank you and Regards, Roger

It’s so much excitement over the E1500 and so far rightly so of what I’ve seen in the videos that’s been posted. On their site the price posted is 2275.00 AUD but no coils are power supply. Coils we know don’t come cheap and for sure going need maybe two but wanting three. Then let’s not forget the power supply we can’t do without. If you go buy three coil new plus power to run it just how off are you from buying the Axiom? Garrett has the TDI SL and would give it a little of whatever it takes to make it better I’d buy it. If they would come out tomorrow you could buy it because it’s already in the USA. I don’t need a screen to read because I want and will dig every signal. I don’t want one that will detect fly specks. I know everything that would come with it cost me money but when I get it I can walk out the door and start hunting. Garrett I’m sure you could be selling it about the same price White’s was before they closed up . Garrett I hope you read this and I believe you could make money. I know you would make a lot of us old hard shell White’s users happy. Chuck

The passing of a friend unfortunately has led to me taking ownership of a modified Tdi Pro. My machine is mounted on an Anderson shaft and is factory spec. My old mate had his machine modified to smooth out the threshold and to add some sensitivity. The specifics related to the modifications are not known by me, other than that they were conducted by 'Luke'..Oz Digger.. This happened some time ago. So the modified machine is probably not a keeper, I don't want two Tdi Pro machines.. The opportunity to do a comparison cannot and should not be ignored. My intention is to focus on small gold performance, the threshold smoothness, the ability to use gain, basic performance and handling characteristics under different circumstances. The machines will use the same fully charged battery pack, same coil, same targets, same test location and conditions on the same day etc. Trying to minimise external variations. I'll start with the usual useless air test. Later I'll follow up with in ground testing on the actual goldfields in mineralized soil. Test coils will be with a small coil and a large coil. Targets will be gold only. The 1 grain ingot, the half gram gold coin, a half sovereign gold coin. Some real small sub gram nuggets to see how small we can go.. There is a process involved so I'll take my time and do it right. Any specific questions or suggestions, speak now or forever hold you peace.. I'm only doing this once. Once it sold it will be too late to revisit.. All the best.

I bought my TDI SL just as White's was closing. Due to other time commitments I have had only limited time to learn the machine. Reading various posts here and on other forums I realize that there are a lot of techniques that I need to learn, whether for gold, relics or coins. My primary interest is gold, but I occasionally search for relics and coins. I have tried searching this forum for information on techniques and videos but no luck. When I use the search term "TDI SL" I do not find any results. I have found just a few videos on YouTube. Any guidance on search terms, links to training videos here or elsewhere, or links to text on techniques would be greatly appreciated. I realize that I may have missed the obvious, and if that is the case, I apologize in advance. Thanks for the help.

Hi, Having recovered a Whites TDI motherboard (not SL) and having a coil. I would like to reconnect it with potentiometers and switches. Does anyone have photos showing the wiring/colors of the switches and potentiometers on the plate and the values/types of the potentiometers (B100k etc.) and switches? Thanks. David

An often performed modification on the Tdi sl or SPP machines is the inclusion of the Philmore S38 vernier dial. Since I often loan my Tdi Sl machines to family or friends I felt it was kinder to install the vernier dial as the original Whites setup was very frustrating in hot ground. Very fussy to say the least. My technique was to simply set up the dial so it starts a zero and does not confuse inexperienced users. Adjustments start at six all the way up, hot ground is usually around 8 or 8.5 for example. Instead of a permanent installation it is fully reversible and very temporary. So for the beach or less challenging ground I leave the factory set up as is. When prospecting simply pull the White's knob off and install the Philmore vernier dial. Brace it using a very firm foam so it doesn't move etc. The foam is a tight fit and holds the vernier dial in place stopping from rotating. The dial is smooth and covers the required ground balance window encountered in the goldfields. It does not turn the Tdi Sl into a Tdi Pro, but it makes ground balancing quick and easy. The photos tell the story, again it works well and is fully reversible. I only use it when out on the goldfields and then remove it for beach work etc. All the best.

I have bought a cover for my Whites TDI SL and described thus: "Whites TDI SL control box cover PLEASE STATE PREFERRED COLOUR/FABRIC CHOICE WHEN ORDERING Helps protect your detector from damage/rain/mud etc Available in Black Neoprene Camo Neoprene" If I had looked at the pictures (I think there are about 11) more carefully, I would not have wasted my money. The cover is as in pictures, but is certainly not dust proof or waterproof with all the gaps. Oh well, it wasn't a lot of money. I did write to the seller saying the item had failings and suggested improvements, but no response. Anyway, I saw another cover somewhere last night online and saved the images. Am I allowed to post the images here to ask two questions: 1. Do you think it will do the job of waterproofness? 2. If it is good, where can I buy it? Or is there another available or plans available from which to make one? Regards, Rog

I have been doing some testing before selling some PI detectors that I really like. The testing was done on 0.75 gram lead, 0.25 gram lead and 0.1 gram gold targets using two containers of dirt from an area northwest of Phoenix Arizona and from an area south of Breckenridge Colorado. Both samples are very mineralized with both iron and volcanic material. I placed each target one inch below the surface of each dirt sample and used a ruler stuck one inch into the containers to measure coil height above the target in the dirt. Not by any means a totally realistic test, but as close as I can get right now. I was using a TDI Pulse Scan stock 14.4v battery with Reg Sniff mods, a GPX 6000 and an Axiom. Here are the results and a photo of the dirt containers. The Arizona dirt was no problem for all three detectors to ground balance on. The Colorado dirt was another story. The TDI would not ground balance well at all on it, the GPX 6000 was noisy on it, amazingly enough the Axiom Mono coil was very quiet on that dirt and the Axiom DD coil came up with some really odd ground balance numbers on that dirt....15/03 and was a bit unstable. I was able to run the sensitivity on the TDI and the Axiom at around 85% of max before they became unstable. The GPX 6000 became unstable at Manual 7 of 10 so I could only run it at 60% of maximum. It might have been able to have even better results, but there was EMI in the area with power lines about 1/4 mile away.

I did a coil test some time ago using a Tdi Pro OZ, quite a variety of coils involved. Just a bit of information not wanting it to go to waste. The test area was located in the middle of the Golden Triangle in Victoria, Australia. Looking at the images the test site is located on a area that produced large nuggets. Heavily mineralized to give the depth tests some authenticity. Targets were varied as were the coils tested. The Tdi Pro was ground balanced, gain was at 5, conductivity was in ALL, pulse delay was 10. Frequency was set in the middle and the audio was boosted by a Nokia MD-11 external speaker. Only clear repeatable signals were recorded. All targets were buried in the ground sideway from a miners hole, so as not disturb the soil on the surface or above the target. Only the 1 grain ingot and one 0.5 gram gold coin were buried from the surface disturbing the ground. Not sure how useful this is for Tdi SL users, deduct 10% maybe.. Just gives a sense of what is realistic is this one location at that one time with the Pro with the variety of coils available back then. All the best, Karelian

There seems to be much interest still on the TDI-SL mods that our friend Reginald Sniff made. I often find old emails in my junk box from people trying to get the mods. I apologize for not replying as I find them late and often busy with day chores. I will share what I still have left from my conversations with Reg many years ago. Most were over the phone as he had difficulty typing on the keyboard. I took notes and why I have the last picture with a summary of the three mods. Correspondence Reg, Thanks for the picture. I do have a few questions regarding my early model SL. 1- you had mentioned in another thread about doing something also with D20 and D21. We spoke only on changing C20, C21 and removing C56. What is the purpose of the D20,21 Mod? 2- Are C20,21 Polarized? what is the direction of flow ? ( thinking about building a board with a toggle switch to change from OEM to modified.} just in case the mod has an effect on my using my BIG coil. 3. If I did a board would the cables running from the capacitor board to the detector board need to be shielded? I just ordered the Reidman battery. Thanks Gilbert EMAIL sent by Reg in response: I mentioned mods added in 2015 to the SL to correct a problem in Australia. The mods to correct that problem included D20 and D21.. The D20 and D21 were part of that mod as was C56. You can remove D20 and short out D21 with a simple jumper to complete the Aussie mods. This will smooth out the ground balancing a little. If you use the proper caps, C20 and C21 are not polarized. Do not use polarized caps. I don't recommend a board to be added. Just tweak the Delay a little if the cap mod increases the sensitivity too much. On the latest pic I sent you, you will see an arrow pointing to C42. Adding a jumper across this cap will increase the gain and make very weak signals more reliable. Adding a jumper is easy. Simply look for two test points TP2 and TP31. They are near C42. Simply add a jumper from one test point to the other jumpers C42 and takes care of the problem. C42 and R75 are a high pass filter that isn't needed and causes problems. Eric added them when he had a drift problem and thought they would help. The drift was coming from some place else he later found out. Reg ( caps being removed are C20 &21, .47uf and will be replaced with .22uf. Use 50v Panasonic, or Rubicon Stacked Metal Film Polyester type ) from another post by Reg Picture sent by Reg My Summary of all three TDI-SL REG mods Gilbert

After reading CaliGold’s posts about his bad luck doing a battery mod on his TDI SL, I am so thankful that I put a TDI Pulse Scan/TDI Pro at the top of my list of wants if one happened to become available. I have only owned TDI SLs and the SPP both of which I battery modded to get more voltage and sensitivity/depth. Those TDI’’s even with the battery voltage increase always left me wanting for more. So, when snakejim’s TDI Pulse Scan modded by Reg Sniff went up for sale on this site I decided that I would try it and see if it was an improvement. All I can say is……Wow. The TDI Pulse Scan that snakejim sold me is amazing. I got a NF Sadie for it as soon as I realized its potential and sold the two Jimmy Sierra/Miner John coils that came with it since I have also always felt that those coils just didn’t measure up. It looked like this TDI with a Sadie might actually make a decent small sub gram gold nugget detector which is something I would have never tried with my previous TDI SL variants. The Sadie and Reg’s modifications did the trick and this TDI can easily equal and out perform my Deus 2 using its FMF Goldfield mode on .25 down to .05 gram nuggets. Very impressive. It’s not a GPX 6000 by any means but this Reg modded TDI Pulse Scan is no slouch with a Sadie. Also, I am so glad I don’t need to worry about doing battery mods and worry about my TDI being underpowered. I always assumed that the difference between a battery modded TDI SL and a normal TDI PulseScan/Pro was minimal. That is simply not the case with this Reg modded TDI Pulse Scan. Thanks Snakejim. I am going to hold onto this TDI and when it’s time to let it go due to my age, I will make sure it goes to a good home.

Is there anything that you can share on the details of getting the 16 volt battery configuration to fit in the TDI BH? I have one that I just bought, and I have heard that I can pickup a few inches of detecting depth with the 14.8v vs. 12 v stock config, and maybe even more depth with the 16v config. I would appreciate any details on whether you saw any harm to the electronics with this extra, applied battery voltage or not, the benefits of the higher voltages, and the needed case mods to make it fit? Thanks kindly. Brittany.

I built a 5 battery 20v pack for my whites TDI SL. Got info from this forum. I think I blew a resistor maybe more. No obvious visual damage but the detector behaves strangely now and signal is delayed on targets. If I put a target to the coil (miner john 8x12 stock) then the signal is delayed from sounding off for maybe 1/4 second or so. Odd... The miner john was handling the 19.8 volts fine but when I put the Coiltek 14" "TDI Series" coil on my troubles began. Wild threshold swings, wont pick up small targets (the 14" wasnt good with them anyhow) and now the MJ 8x12 has same delayed signal sound and struggles to pick up a 1.5 gram gold cross I used to test it with. The detector "works" it's just wonky and no use for prospecting now... Any help or thoughts greatly appreciated as well if anyone knows the wattage on the small 2512 size resistor at R9 area and around there I'd greatly appreciate the knowledge.. I've used the detector before in all areas it acted strangely in so please rule out EMI... I'm sort of in the country and it's relatively low signals around here despite the housing and especially in the river bed near my house. I think the Coiltek jacked up my PCB parts somehow. Thanks and have fun laughing at my rookie mistake!