Epiphone Valve Junior Head

[tot_Ou_tard]

As it says in that forum thread, you won't know for sure until you try it and hear it for yourself. With quality new production tubes running somewhere around $10 each, it isn't too painful to try a couple different combos and see what suits your ear. AAMOF, you've piqued my interest a bit, so I'll probably try a few tube swaps on my own VJr over the weekend. Mine is currently set up for early breakup, but I have a "clean" EL84 that I got from Eurotubes, and several different 12**7 preamp tube flavors on hand, even down as low as the 20% gain 12AU7....

Vood, have you ever looked into the mercury mod?

http://www.mercurymagnetics.com/page...Pjt/EVJ-01.htm

It's sounds right up your alley. Although it costs $300 to get the kit.

[M29]

Hello guys,

I am interested in either a Valve Junior or building a Champ and I have run across some info where some guys are using Hammond organ transformers with good success. I don't know enough about this yet to know if they are less expensive then some of the upgrades or not but I know the transformers especially the output transformer is one of the most important parts in the tube amp mix.

Looking forward to more info on this little bugger!

M29

[tot_Ou_tard]

Hello guys,

I am interested in either a Valve Junior or building a Champ and I have run across some info where some guys are using Hammond organ transformers with good success. I don't know enough about this yet to know if they are less expensive then some of the upgrades or not but I know the transformers especially the output transformer is one of the most important parts in the tube amp mix.

Looking forward to more info on this little bugger!

M29

I read an articale about Goodsell amps (a boutique amp with great press). The builder (is he a Mr Goodsell? I forget. If so great name) was originally in the organ (as in Hammond) renovation business & started building amps out of spare Hammond parts.

[duhvoodooman***]

Vood, have you ever looked into the mercury mod?

http://www.mercurymagnetics.com/page...Pjt/EVJ-01.htm

It's sounds right up your alley. Although it costs $300 to get the kit.

Yep, have seen that one. Lemme see....do a $300 mod to a $100 amp? Er, no thanks. Kind of defeats the purpose, if you ask me.

[tot_Ou_tard]

Yep, have seen that one. Lemme see....do a $300 mod to a $100 amp? Er, no thanks. Kind of defeats the purpose, if you ask me.

That's what I figured you'd say. So it's time to build your own trannies!

Voodoo Transformers: transform your mojo.

The ad copy writes itself.

[bagger78]

welcome to the world of tube addicts. another alternative to an 12ay7 is a 5751, which is at 70% instead of 60%. ive got a eh and an nos jan ge coming to clean up my crate vc 20 and to try in a silverface fender music master bass amp to pick up a touch more gain. swap em around with the full retube on the crate to see what does which to who. eurotubes doesnt have them so daves tubes, or tube store will have em . eurotubes the only way to go for jj's tho. great helpful people there. be prepared tho to get a soldering iron and a box for extra tubes ,caps ,and fiddely lil parts because now youre entering (cue music....DUN...DUN...DUN) "THE TWEAKHEAD ZONE". dont forget to shop for a tablesaw to make all the boxes for the speakers youre gonna collect on e-bay. dont ask me how i know all this. enjoy

[tunghaichuan***]

Here is a reply I posted on the Gibson/Epiphone board:

One thing to consider: even though the 12A*7 type tubes look alike superficially and share the same pinout, a 12AU7 is *not* a low gain 12AX7. A 12AT7 is *not* a lower gain 12AX7, nor is a 12AT7 a higher gain 12AU7. Some tubes like the 12AY7 happen to be close enough to use in 12AX7 circuits (like Fender did in their 50s tweed amps). But all these tubes differ in their characteristics. Dropping a different tube into a circuit designed for a 12AX7, may work for you, but it will not be optimal unless you change the cathode and anode resistors. But since we are discussing guitar amps, you may or may not like the results.

tung