Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: ALBATROS1234 on March 31, 2018, 10:42:43 am

Title: using a pentode to drive a tremolo circuit?
Post by: ALBATROS1234 on March 31, 2018, 10:42:43 am

usually it seems most schematic i have seem has a 12ax7 or the like to run a tremolo, has anyone used a pentode like a 6sj7 or similar to run a tremolo circuit, is it due to the "dual triode" or dual amp stages(pre and post)? if so can 2 pentodes (pre and post) be used? i have a couple 6j7 with grid contacts sticking out the top of the tube that i want to used for something. i have a bunch of good unused tubes i would like to play with. for instance i got a great deal($20 +18shipping) on a 1951 revere reel to reel, inside was all rca 2x6j7, a 6sj7, 6k6 and the exception is the 6v6 which is this beautiful sounding national union 1951 black glass .

Title: Re: using a pentode to drive a tremolo circuit?
Post by: sluckey on March 31, 2018, 11:28:07 am

Look at some Silvertone schematics, 1300 and 1400 series.

Title: Re: using a pentode to drive a tremolo circuit?
Post by: ALBATROS1234 on March 31, 2018, 11:36:36 am

tanks bruddah

Title: Re: using a pentode to drive a tremolo circuit?
Post by: tubenit on April 01, 2018, 12:21:25 pm

I think this one on the Silvertone 1482 and Dano Centurian 275  (very similar amp as 1482) is a great tremolo.  It's always been my favorite.

http://el34world.com/charts/Schematics/files/silvertone/silvertone1482.pdf

http://el34world.com/charts/Schematics/files/danelectro/danelectro_centurian_275.pdf

Uses a 6AU6.  A 5654 will work well also.

with respect, Tubenit

Title: Re: using a pentode to drive a tremolo circuit?
Post by: kagliostro on April 01, 2018, 01:56:37 pm

Here there is an article about oscillators

Working with Phase-Shift Oscillators - December 1958 Popular Electronics

they talk (really a bit) also about pentode oscillators

http://www.rfcafe.com/references/popular-electronics/after-class-Phase-Shift-Oscillators-december-1958-popular-electronics.htm (http://www.rfcafe.com/references/popular-electronics/after-class-Phase-Shift-Oscillators-december-1958-popular-electronics.htm)

Franco

Title: Re: using a pentode to drive a tremolo circuit?
Post by: ALBATROS1234 on April 01, 2018, 06:59:00 pm

Thanks a lot guys gives me some interesting reading.  I figured it could be done with a pentide. I imagine it changes tone a bit too. Awesome.i really want to build amps with unique tone