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FDP Forum / Amp Mods, Repairs, and Projects / Pro Jr with 6V6

Nawlins Dawg

N.O.,LA USA

There's no place like tone
Nov 14th, 2018 08:55 PM   Edit   Profile  

Assuming an adapter exists that would allow 6V6’s to replace the stock EL84 power tubes, would the amp operate without something going up in smoke? I’d simply like to hear the sonic differences between the two tubes in a relatively simple platform like the Pro Jr

(This message was last edited by Nawlins Dawg at 11:00 PM, Nov 14th, 2018)

Cal-Woody

USA/California

Why do I keep fixing things that work?
Nov 14th, 2018 09:09 PM   Edit   Profile  

Check out Yellowjackets adapters. I think they can use 6V6 tubes, but not sure. The Tube Supply Store may have them.

Peegoo
Contributing Member
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Four feets

By eight feets
Nov 15th, 2018 12:59 PM   Edit   Profile  

Yellowjackets only allow substitution of EL84/6BQ5 into amps that originally use octal power tubes such as 6L6, EL34, 6V6, 7027, 6550, 7591, etc.

They won't work for conversion of an amp from EL84/6BQ5 to something else.

Amps are built to sound best with the tubes they spec as stock equipment. One thing you never hear about is someone tracking guitars using an amp that has Yellowjackets in it. The reason is because if you want an EL84 tone, you use an EL84 amp.

Yellowjackets work, but beyond doing simple taste testing, they're not that useful, IMHO. Your own mileage may vary!

Look around for an old Ampeg Jet. These were issued with a pair of 6V6s or 7591s, and were in the 12-15-watt class similar to a Fender tweed Deluxe or a Princeton Reverb. They are pretty affordable if you shop around and are patient.

Ihe older Ampegs are generally not as bright and sparkly sounding as Fender amps because owner Everette Hull wanted to cater to jazz cats--not rockers--in the early 1960s. More recent Jets (Jet II model) used a pair of EL84s.

Find a Jet--or even better--an older 6V6 Ampeg Reverberocket, and you'll have a smokin' little rock and roll amp.



Nawlins Dawg

N.O.,LA USA

There's no place like tone
Nov 15th, 2018 03:32 PM   Edit   Profile  

I hear you, Peeg - I bought a pair of Yellowjackets for a Super Reverb that I owned years ago (yes, I wish that I still had that amp) with the goal of taming some of the volume w/ earlier breakup, etc. etc. What I learned from that ill advised endeavor is that what I gained in lessening the volume was offset by the generic tone that resulted. Won't say that it was bad, but it was certainly nothing special. I suspect that it would be the same thing with this idea of mine. In the end, I guess what it comes down to is that amp designs are optimized for a particular power tube, transformer spec, component values and all that bit, and that simply substituting a power tube won't bring out the best of the substituted tube

Peegoo
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Four feets

By eight feets
Nov 15th, 2018 05:00 PM   Edit   Profile  

That is true. The appeal of Yellowjackets is understandable though, because it allows a player to try EL84 tone without spending $$ on a complete amp.

If you like to experiment, there are several amps from various makers that allow you to swap different power tubes in. For example, the original Kasha Evil Robot 1x12 combo is a 2x 6V6 beast that allows pulling one of the power tubes, or swapping in pretty much any octal power tube or pair of tubes.

John Kasha's statement to me about this was, "you cannot kill this amp." I've tried, and he's right.

Even better, some amps (see link) let you flip a switch to change to different power tube(s) already inside the amp.

Stephenson Deluxe: selectable power tubes

BbendFender
Contributing Member
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American Patriot

About as ordinary as you can get.
Nov 16th, 2018 09:32 AM   Edit   Profile  

I watched this video just last night. Converting Pro Jr. to 6V6. Looks like an involved process but this guy up in Battle Creek can do it.

6BQ5 to 6V6.

Nawlins Dawg

N.O.,LA USA

There's no place like tone
Nov 17th, 2018 06:56 AM   Edit   Profile  

Thanks, Bbend - that really hit the nail on the head for me. Such a project would be way beyond my skill set, but his approach to it answered some questions for me. He’s a bit of a cruel dude for not firing it up and letting folks hear it, though

FDP Forum / Amp Mods, Repairs, and Projects / Pro Jr with 6V6




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