Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: dude on October 13, 2021, 08:55:40 pm
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Can’t seem to find a small, 16 or 17 mm diameter 50kl, 1/4” diameter thread with a screw slot. A locking nut would be great.
Someone posted a vender that sells locking bias pots but l lost the link. I tried Mouser, Digikey but no luck
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I have not seen those for sale anywhere.
I use Bourns 3296 -- they can be inconvenient due to their legs/connections, but they are very robust and do not lose their setting.
Yeah, I know those are not what you want . . .
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Well, Weber designed that amp. Did you look there???
https://www.tedweber.com/wp503l-slot/
Or do you mean these that require a 1/4" mounting hole? Look at the last two pics...
http://sluckeyamps.com/sunn/sunn.htm
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I think I bought mine at Mouser or Digikey? I think their Precision Electronics, but others make them too.
Do a search for; mil. spec, 2w, wire wound, locking nut.
They are small body.
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Or do you mean these that require a 1/4" mounting hole? Look at the last two pics...
http://sluckeyamps.com/sunn/sunn.htm (http://sluckeyamps.com/sunn/sunn.htm)
Yes, Weber’s design. Yes, looked at Weber they no longer carry 1/4”, saw the 3/8” hole 50kl but the back face plate is drilled for 1/4”, if l drill it out, takes the lettering with it.
Your last picture, the two pots would work. I decide to not use pin jacks and just keep the stereo jack. As long as the pots aren’t extremely big bucks they would work, available?
But did find a 1/4” hole 50kl, with a slotted thin shaft, but it’s 25kl. I thought of raising the 39k R supply before the diode, then maybe use a 27k to ground off the bias pot but …, not sure that would give me the range. Probably better to use a pot like your Sunn pic, if it’s available in 50kl
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Do a search for; mil. spec, 2w, wire wound, locking nut.
They are small body.
I try again using your filters, thanks l think l did see those 2 watts, expensive..?
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What l did for my Plexi’s was use a reg solid shaft, cut it shorter and cut a screw slot. Seems to stay out of the way from accidental turning, l think available in 16mm, 50kl, 6.5mm hole
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These pots are called RV6 blah-blah-blah. Lot's of them in military and FAA equipment. Here you go. Buy two so they will match. Won't be a better price...
https://www.ebay.com/itm/202145285373?hash=item2f10cc44fd:g:CJkAAOSw3ZtaL1CM
BTW, the bias pots in my Plexi6V6 and Phoenix are both 50K RV6.
http://sluckeyamps.com/6v6plexi/P-6V6_05_big.jpg
http://sluckeyamps.com/phoenix/p12_big.jpg
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Thanks,
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These pots are called RV6 blah-blah-blah. Lot's of them in military and FAA equipment. Here you go. Buy two so they will match. Won't be a better price...
https://www.ebay.com/itm/202145285373?hash=item2f10cc44fd:g:CJkAAOSw3ZtaL1CM (https://www.ebay.com/itm/202145285373?hash=item2f10cc44fd:g:CJkAAOSw3ZtaL1CM)
BTW, the bias pots in my Plexi6V6 and Phoenix are both 50K RV6.
http://sluckeyamps.com/6v6plexi/P-6V6_05_big.jpg (http://sluckeyamps.com/6v6plexi/P-6V6_05_big.jpg)
http://sluckeyamps.com/phoenix/p12_big.jpg (http://sluckeyamps.com/phoenix/p12_big.jpg)
I just got the pec pots from the link you provide above. I cannot thank you enough, they are about as small as a pin jack in length, extremely accurate. I opened the link from eBay the next morning to order and they raised the price a dollar, l guess they had so much action… :icon_biggrin: .
Thank you again!
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They add a touch of class to your projects.
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I’ve been looking at bias pots as well. So I’m assuming the RV4LAY is just the larger 2W version?
https://www.digikey.com/en/products/detail/nte-electronics-inc/501-0060/11646225 (https://www.digikey.com/en/products/detail/nte-electronics-inc/501-0060/11646225)