Dave Vader Posted January 30, 2013 Share Posted January 30, 2013 So I have an ancient Peavey TNT 115 in my garage, and have had for ages now. here it is. [url="http://www.flickr.com/photos/50579126@N03/8430994920/"][/url] [url="http://www.flickr.com/photos/50579126@N03/8430994920/"]IMG-20130130-00223[/url] by [url="http://www.flickr.com/people/50579126@N03/"]Plastic Squirrel[/url], on Flickr It still works (obviously it's a Peavey) but has a bit of a problem, which is...... [url="http://www.flickr.com/photos/50579126@N03/8430995466/"][/url] [url="http://www.flickr.com/photos/50579126@N03/8430995466/"]IMG-20130130-00222[/url] by [url="http://www.flickr.com/people/50579126@N03/"]Plastic Squirrel[/url], on Flickr The pre and the low pots have snapped off and there is not enough left even to twist them with a set of pliers to just set and forget. I read somewhere that you can slam in any old pot and attach with three wires (obviously as long as it's the right value pot, I'm not that dumb) but was not sure if there was enough space in this one, so I took a photo.... [url="http://www.flickr.com/photos/50579126@N03/8429910305/"][/url] [url="http://www.flickr.com/photos/50579126@N03/8429910305/"]IMG-20130130-00221[/url] by [url="http://www.flickr.com/people/50579126@N03/"]Plastic Squirrel[/url], on Flickr and then I took another photo.... [url="http://www.flickr.com/photos/50579126@N03/8429911345/"][/url] [url="http://www.flickr.com/photos/50579126@N03/8429911345/"]IMG-20130130-00219[/url] by [url="http://www.flickr.com/people/50579126@N03/"]Plastic Squirrel[/url], on Flickr and then I though I'd ask you guys if you've managed to successfully fix one like this with the maplin pot option. Or if any of you just happen to have some old peavey amp pots around that I could get for cheap. I only want it as a backup/thing to play with in the house. So I'm not entirely bothered, if it's not cheap I'll sell it on for a project to someone, as it's eminently fixable. The other pots need a bit of a clean, as they have a "sweet spot" where they make sound, and the rest is crackle and fuzz. But I remember quite liking it back in the day when it worked properly. And it would be nice to have it back. Thanks for any help you can offer... Quote Link to comment Share on other sites More sharing options...
3below Posted January 30, 2013 Share Posted January 30, 2013 (edited) Need closer picture of pots to see how they are connected - solder to board or what. Also the dimensions - diameter of pot would be useful. I guess you know the values of the pots, if not [url="http://www.lbquota.net/cms/sites/default/files/download/105/peaveytnt115.pdf"]http://www.lbquota.n...eaveytnt115.pdf[/url] or Peavey are very obliging. They can also provide technical support above and beyond the schematics. I wanted to know the available heater current of a 1980s valve amp transformer - no problem. Look at the internals and appreciate the large discrete components with substantial PCB tracks. DIY repair is possible unlike a lot of modern kit Edited January 30, 2013 by 3below Quote Link to comment Share on other sites More sharing options...
Beer of the Bass Posted January 30, 2013 Share Posted January 30, 2013 (edited) Antique Electronic Supply in the US have a load of Peavey parts, but by the time they've shipped from the states it won't be all that cheap; [url="http://www.tubesandmore.com/products/potentiometers_0?sort=recommended&page=0&filters=Brand%3DPeavey"]http://www.tubesandm...=Brand%3DPeavey[/url] I replaced a volume pot on a friend's Peavey practice amp (can't remember the model) and the 16mm pots from bitsbox fitted the holes on the PCB well enough, though I don't know if yours uses the same pots. The one I used was one of these; [url="http://www.bitsbox.co.uk/resistors/potentiometers.html#16pot"]http://www.bitsbox.c...ters.html#16pot[/url] The original Peavey knob didn't fit on them, but if you're going for cheap and functional, that may not be an issue. Edited January 30, 2013 by Beer of the Bass Quote Link to comment Share on other sites More sharing options...
Dave Vader Posted January 30, 2013 Author Share Posted January 30, 2013 [quote name='3below' timestamp='1359579320' post='1957066'] Need closer picture of pots to see how they are connected - solder to board or what. [/quote] yeah, they are soldered to the board, but I saw this bit of genius [url="http://idiy.blogspot.co.uk/2011/10/repairing-peavey-bandit-112-guitar-amp.html"]http://idiy.blogspot.co.uk/2011/10/repairing-peavey-bandit-112-guitar-amp.html[/url] and thought that that dude had an idea that I could steal. Quote Link to comment Share on other sites More sharing options...
Dave Vader Posted January 30, 2013 Author Share Posted January 30, 2013 [quote name='Beer of the Bass' timestamp='1359579373' post='1957069'] Antique Electronic Supply in the US have a load of Peavey parts, but by the time they've shipped from the states it won't be all that cheap; [url="http://www.tubesandmore.com/products/potentiometers_0?sort=recommended&page=0&filters=Brand%3DPeavey"]http://www.tubesandm...=Brand%3DPeavey[/url] I replaced a volume pot on a friend's Peavey practice amp (can't remember the model) and the 16mm pots from bitsbox fitted the holes on the PCB well enough, though I don't know if yours uses the same pots. The one I used was one of these; [url="http://www.bitsbox.co.uk/resistors/potentiometers.html#16pot"]http://www.bitsbox.c...ters.html#16pot[/url] The original Peavey knob didn't fit on them, but if you're going for cheap and functional, that may not be an issue. [/quote] That looks quite promising, most of the knobs have been lost over the years anyway. I look forward to using the TNTs at the local practice room dives, as they are in better nick than mine Quote Link to comment Share on other sites More sharing options...
3below Posted January 30, 2013 Share Posted January 30, 2013 Nice repair idea, is just a matter of getting stuck in with correct value pots. I like Peavey kit of that era, it is bombproof and repairable. Downside was I did not enjoy the weight of my Bass Combo 300. Quote Link to comment Share on other sites More sharing options...
stingrayPete1977 Posted January 30, 2013 Share Posted January 30, 2013 I would get a little 1.0mm drill bit and drill the remaining bit then glue a tiny dowel of some sort into place then do the reverse to a piece that fits the knob or even the actual original bits if you have them? I tiny dab of araldite between the two and duct tape it all in place leaving it a good 24 hours and it will be as good as new! Good dose of servisol over everything and then keep a dust cover over it, I loved my old tnt Quote Link to comment Share on other sites More sharing options...
EBS_freak Posted January 30, 2013 Share Posted January 30, 2013 Ha ha. Pete. You pike! Quote Link to comment Share on other sites More sharing options...
icastle Posted January 31, 2013 Share Posted January 31, 2013 I'd just go for a couple of PCB mount pots. If they look about right in the picture then they'll probably fit - manufacturers tend to go for 'standard' components so they can source them from an alternative supplier later down the line if they need to. If they fit the holes then great, if they don't then I'd just hardwire them. If it's been sat around for a while then giving the non busted pots a squirt of switch cleaner wouldn't go amiss while you have the lid off... Quote Link to comment Share on other sites More sharing options...
icastle Posted January 31, 2013 Share Posted January 31, 2013 [quote name='stingrayPete1977' timestamp='1359580155' post='1957085'] I would get a little 1.0mm drill bit and drill the remaining bit then glue a tiny dowel of some sort into place then do the reverse to a piece that fits the knob or even the actual original bits if you have them? I tiny dab of araldite between the two and duct tape it all in place leaving it a good 24 hours and it will be as good as new! Good dose of servisol over everything and then keep a dust cover over it, I loved my old tnt [/quote] Well that'd certainly work. The only thing to be wary of is that on the other end of that broken plastic shaft is a small metal wiper assembly that rubs against the track. If the knob has been sheared off the front then there's a fair chance that the shaft is no longer as well attached to that wiper assembly as it originally was. Quote Link to comment Share on other sites More sharing options...
Dave Vader Posted January 31, 2013 Author Share Posted January 31, 2013 [quote name='stingrayPete1977' timestamp='1359580155' post='1957085'] I would get a little 1.0mm drill bit and drill the remaining bit then glue a tiny dowel of some sort into place then do the reverse to a piece that fits the knob or even the actual original bits if you have them? I tiny dab of araldite between the two and duct tape it all in place leaving it a good 24 hours and it will be as good as new! Good dose of servisol over everything and then keep a dust cover over it, I loved my old tnt [/quote] Genius, but a new 1mm drill bit (I have snapped all of mine) is probably going to cost more than a couple of pots. Quote Link to comment Share on other sites More sharing options...
Dave Vader Posted January 31, 2013 Author Share Posted January 31, 2013 [quote name='icastle' timestamp='1359596524' post='1957434'] If it's been sat around for a while then giving the non busted pots a squirt of switch cleaner wouldn't go amiss while you have the lid off... [/quote] More than a squirt, it's knackered.... Quote Link to comment Share on other sites More sharing options...
icastle Posted January 31, 2013 Share Posted January 31, 2013 [quote name='Dave Vader' timestamp='1359625347' post='1957639'] More than a squirt, it's knackered.... [/quote] Ok, make it a gallon then Quote Link to comment Share on other sites More sharing options...
brensabre79 Posted January 31, 2013 Share Posted January 31, 2013 You could try Peavey UK. I got an inductor for my old Peavey Combo (the forerunner to the TNT - that should give yo an idea of its age). Well, it took them around 18 months, but they found one and sent it to me! I'm sure they will be able to supply the same pots as the original, or at least tell you what type, and then its just a case of replacing whats there... Quote Link to comment Share on other sites More sharing options...
Matt P Posted January 31, 2013 Share Posted January 31, 2013 i'm a bit bored so i had a look at the pics and the schematic, i think that you need VR1 (10k linear) and VR3 (50k Linear) i think these are the right pots http://www.ebay.co.uk/itm/2pcs-Potentiometer-Pot-B10K-10K-Linear-shaft-20mm-/150592219036?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item230ffee79c http://www.ebay.co.uk/itm/2pcs-Potentiometer-Pot-B50K-50K-Linear-shaft-15mm-/160573866934?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item2562f2c3b6 both are from china but it's only just over a fiver for 2 of each of the pots, worth a shot? Matt Quote Link to comment Share on other sites More sharing options...
Protium Posted January 31, 2013 Share Posted January 31, 2013 First option, 64p each (+ postage), should solder straight into the board as a direct replacement http://www.bitsbox.co.uk/resistors/potentiometers.html Quote Link to comment Share on other sites More sharing options...
Dave Vader Posted January 31, 2013 Author Share Posted January 31, 2013 I love you guys. :) Quote Link to comment Share on other sites More sharing options...
3below Posted January 31, 2013 Share Posted January 31, 2013 The power of basschat [size=4] [/size] Quote Link to comment Share on other sites More sharing options...
icastle Posted January 31, 2013 Share Posted January 31, 2013 [quote name='3below' timestamp='1359669332' post='1958679'] The power of basschat [/quote] All we need to do now is concentrate really hard and see if we can solder them in remotely and finish the job off... Quote Link to comment Share on other sites More sharing options...
stingrayPete1977 Posted February 1, 2013 Share Posted February 1, 2013 (edited) Changed my mind, little pan head self tapper screwed in to the stub, test it to see if the old pots work then if they do all you need to do is epoxy glue the knob to the head of the screw! There is 64 pence per pot at stake here! Edited February 1, 2013 by stingrayPete1977 Quote Link to comment Share on other sites More sharing options...
icastle Posted February 1, 2013 Share Posted February 1, 2013 [quote name='stingrayPete1977' timestamp='1359676807' post='1958844'] There is 64 pence per pot at stake here! [/quote] Pete's next trick will be to tell us how to get 12 cups of tea out of one teabag... Quote Link to comment Share on other sites More sharing options...
Dave Vader Posted February 1, 2013 Author Share Posted February 1, 2013 [quote name='stingrayPete1977' timestamp='1359676807' post='1958844'] Changed my mind, little pan head self tapper screwed in to the stub, test it to see if the old pots work then if they do all you need to do is epoxy glue the knob to the head of the screw! There is 64 pence per pot at stake here! [/quote] Like it... might even do it later, saves taking the amp out... Quote Link to comment Share on other sites More sharing options...
stingrayPete1977 Posted February 1, 2013 Share Posted February 1, 2013 [quote name='icastle' timestamp='1359684006' post='1958904'] Pete's next trick will be to tell us how to get 12 cups of tea out of one teabag... [/quote] I was not like this until you taught me your make do and mend philosphy in the gardening thread! Quote Link to comment Share on other sites More sharing options...
stingrayPete1977 Posted February 1, 2013 Share Posted February 1, 2013 [quote name='Dave Vader' timestamp='1359712308' post='1959056'] Like it... might even do it later, saves taking the amp out... [/quote] What have you got to lose if the pot snaps in half trying? well £1.28p but you know what I mean! Quote Link to comment Share on other sites More sharing options...
icastle Posted February 1, 2013 Share Posted February 1, 2013 [quote name='stingrayPete1977' timestamp='1359741449' post='1959779'] I was not like this until you taught me your make do and mend philosphy in the gardening thread! [/quote] Well in that case... Drill a small hole in the remainder of the pot shaft. Insert a wormwood seed, water it and place a jam jar over it as a makeshift propagator. Once the plant has grown and flowered, allow it to die back and carve the remaining stem into a suitable shaft. Quote Link to comment Share on other sites More sharing options...
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