Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: skyclad on May 27, 2010, 06:01:13 pm

Title: convert Tremolux from 6L6 to 6BQ5?
Post by: skyclad on May 27, 2010, 06:01:13 pm

what would it take to convert a 6L6 Tremolux to 6BQ5 or EL84? What about plate or screen voltage? anything you'd change in the tone circuit to take advantage of different tubes?

thanks

Title: Re: convert Tremolux from 6L6 to 6BQ5?
Post by: dwp on May 27, 2010, 07:21:58 pm

I'll bite. why would you want to? if you're in a blackface tremolux, your voltages will be too high for EL84. your OT is not close to correct impedance for EL84.  Aside from that, it would be downgrading. What's wrong with the Tremolux?

Title: Re: convert Tremolux from 6L6 to 6BQ5?
Post by: P Batty on May 27, 2010, 09:58:31 pm

There was a Tremolux with 6BQ5's,  the 6G9.

Title: Re: convert Tremolux from 6L6 to 6BQ5?
Post by: 6G6 on May 28, 2010, 05:41:30 am

Yeah, Leo beat ya too it, by 50 years.
It only lasted part of the first year,
so I guess it wasn't very popular.
It might be interesting, though.

Title: Re: convert Tremolux from 6L6 to 6BQ5?
Post by: P Batty on May 28, 2010, 08:38:19 am

6BQ5 Tremolux Amp Porn:

http://hkguns.zenfolio.com/p665440257

Title: Re: convert Tremolux from 6L6 to 6BQ5?
Post by: phsyconoodler on May 28, 2010, 04:31:37 pm

Yellow jackets.No need for a butcher job.If you don't like them,sell them on flea bay.

Title: Re: convert Tremolux from 6L6 to 6BQ5?
Post by: skyclad on May 29, 2010, 10:51:41 pm

I was thinking it might sound good in a 2X10 combo. 6G9 is hard to find but I'm looking.
Batty great pics - never seen EL84 tube retainers like that. Tube chart looks like a mimeograph!
Is there anything you could do besides replacing the OT to help the impedance mismatch?

Title: Re: convert Tremolux from 6L6 to 6BQ5?
Post by: P Batty on May 29, 2010, 11:14:49 pm

I wish that was my amp! That has to be the Holy Grail of Blond Fenders- less than 100 made- I've actually played one a few years ago, and could have bought it for $1200.  It sounded good, with very nice balanced tone, but it wasn't real loud. I think a Deluxe OT would work with an 8Ω load, probably OK with 4Ω.

Title: Re: convert Tremolux from 6L6 to 6BQ5?
Post by: skyclad on May 29, 2010, 11:42:15 pm

$1200 - yowie! That sounds like a lot but I know it's relative. Even the electrolytics look new (old).
Just dreaming here. I have two AB763 amps and want something different.
6G9 has a bias voltage on the output tubes but no adjustment - yellowjackets run in cathode bias.
Also, the yellowjackets might be too tall in a head box, ok in a combo.