Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => PC Express and JSchem - Schematics and Layout diagrams => Topic started by: tubeswell on February 04, 2017, 03:20:48 pm

Title: Eric Tremolux
Post by: tubeswell on February 04, 2017, 03:20:48 pm

Got an EC Tremolux on the bench at the moment and thought I'd trace out the schematic


Here you go.

Title: Re: Eric Tremolux
Post by: sluckey on February 04, 2017, 04:16:06 pm

Would you mind posting that in a pc friendly format? Maybe pdf, or png, or sch?

THX... Steve

Title: Re: Eric Tremolux
Post by: tubeswell on February 04, 2017, 07:21:30 pm

Here you go

Title: Re: Eric Tremolux
Post by: Willabe on February 06, 2017, 10:12:02 am

Thanks Pete, I was wondering what was under the hood in those EC amps.

Please let us know how it sounds, really how the trem sounds.

Is there an RC missing on the LFO in your drawing? Looks like only 2 RC phase stages from LFO plate to grid?

Title: Re: Eric Tremolux
Post by: tubeswell on February 07, 2017, 05:43:02 am

Quote from: Willabe on February 06, 2017, 10:12:02 am

Thanks Pete, I was wondering what was under the hood in those EC amps.

Please let us know how it sounds, really how the trem sounds.

Is there an RC missing on the LFO in your drawing? Looks like only 2 RC phase stages from LFO plate to grid?

The amp has fairly earlyish breakup - like a 5E3, and the trem sounds really good. The LFO C/R network is 0.033uF/3MRA-0.01uF/1M-0.01uF/1M

Title: Re: Eric Tremolux
Post by: Willabe on February 07, 2017, 08:51:48 am

Thanks Pete.  :icon_biggrin:

Title: Re: Eric Tremolux
Post by: BetterOffShred on February 07, 2017, 01:37:35 pm

I'm amazed they want as much cash for these things as they do.  Seems kind of ludicrous
Thanks for the scheme!
-Brett

Title: Re: Eric Tremolux
Post by: tubeswell on February 07, 2017, 03:08:02 pm

FYI - 'Dave H' over at ampage did a sim of the bias supply if one of the .1uF coupling diodes is increased to .2uF. (attached) (I.e. you should be able to get -50V out of it)

Title: Re: Eric Tremolux
Post by: DummyLoad on February 07, 2017, 10:18:48 pm

thnx pete!


--pete

Title: Re: Eric Tremolux
Post by: roseblood11 on September 15, 2019, 10:38:49 pm

Any ideas for the unused triode?

Title: Re: Eric Tremolux
Post by: tubeswell on September 07, 2020, 03:22:40 am

Quote from: roseblood11 on September 15, 2019, 10:38:49 pm

Any ideas for the unused triode?

Title: Re: Eric Tremolux
Post by: 2deaf on September 16, 2020, 07:02:11 pm

Quote from: roseblood11 on September 15, 2019, 10:38:49 pm

Any ideas for the unused triode?

I just now noticed the year was 2019.  I thought it was a current post.  Here's an idea, nonetheless.





 

Title: Re: Eric Tremolux
Post by: shooter on September 17, 2020, 07:25:35 am

 :laugh:


2019 was a GREAT year