Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

potentiometer for preamp
potentiometer for preamp
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 3rd September 2019, 05:15 PM   #1
myphoebe is offline myphoebe
diyAudio Member
Join Date: Jan 2019
Default potentiometer for preamp

Any one every try a Precision pot for volume control. Available at Mouser. Mil -spec
  Reply With Quote
Old 4th September 2019, 12:08 AM   #2
Monte McGuire is offline Monte McGuire
diyAudio Member
Join Date: Jul 2013
potentiometer for preamp
Yes! They are exact replacements for the MIL RV4 style hot mold carbon pots like the Allen Bradley Type J pots from the '50s.

I was restoring a few UREI LA-3A limiting amplifiers, which used Type J pots, and the originals became intermittent and noisy. I do not expect hot mold pots to be sonically neutral, and because of that, I wanted to restore the unit using hot mold replacement pots. You can get NOS Type J and also Ohmite type AB pots, but for maximum life, I wanted brand new pots that haven't been sitting around for 40 years whose tracks have 'gone weird'. Not sure if that happens, but I didn't want to find out and the new Precision pots are nicely priced, and brand new.

After installing them and rotating them a bit to 'settle them in', they seem to work great - just like a brand new, quiet Type J.

I'd recommend them if you want the noise and voltage coefficient of a hot mold carbon pot - they're well manufactured and attractively priced, and remove the uncertainty of NOS parts. If you want "clean" I would not recommend them, but then again, I did not measure their distortion - they were going into a '70s circuit that is decidedly not clean and authenticity was more important for that device than cleanliness. So, for circuits like this and tube circuits from the '50s, I would recommend them highly.
  Reply With Quote
Old 4th September 2019, 02:49 PM   #3
myphoebe is offline myphoebe
diyAudio Member
Join Date: Jan 2019
Thanks for the education
  Reply With Quote


potentiometer for preampHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Potentiometer replacement preamp Esotech PII Gradiente fabianoliver Analog Line Level 6 20th March 2019 12:58 PM
FS: passive preamp with 48 step Khozmo potentiometer jean-paul Swap Meet 0 6th February 2013 09:50 PM
MiniDSP -> Passive preamp/potentiometer. Impedance matching? lofgrenmeister Digital Line Level 15 26th August 2011 03:04 PM
Looking for Yamaha AB3A preamp potentiometer Markus2006 Parts 2 29th June 2010 07:57 AM
Preamp or potentiometer fireman Chip Amps 3 28th May 2004 12:03 AM

New To Site? Need Help?

All times are GMT. The time now is 11:21 AM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio