EL84 to 6V6 adapter???

HawkeyeKane

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1,325
Now...Yellow Jackets and their kind are proven and tried and true...but I came across this today and it has me wondering...

http://pages.ebay.com/link/?nav=item.view&id=190884999062&alt=web

I'd love to be able to try one in my Kalamazoo Model Two, which is a SE cath biased amp...



But from what I've been told, the cath resistor wouldn't be able to handle a 6V6...

Anyone had any experience with these? Do they have internal resistors and such to compensate and just be a plug n' play type of deal with any amp?
 
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Mike9

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Interesting - also interesting that there is no description of the inner workings.
 

Blue Strat

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30,199
Maybe there's nothing in there but wire, re-pinning the connections. In that case, your cathode resistor (at least) would have to change.

If the EL84s hang down in this amp good luck keeping the much heavier 6V6+adapter in the socket.
 
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Tone_Terrific

Silver Supporting Member
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34,018
Maybe there's nothing in there but wire, re-pinning the connections.
All you need in there.
I've tried to make something like that and it's harder than one might think.

In that case, your cathode resistor (at least) would have to change.

If the EL84s hang down in this amp good luck keeping the much heavier 6V6+adapter in the socket.
Good point on the space limitations. Measure b4 purchase!
 

Blue Strat

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All you need in there.
I've tried to make something like that and it's harder than one might think.
Well, except for the bias resistor change. A 6V6 won't last very long with an EL84 cathode bias resistor value.


Good point on the space limitations. Measure b4 purchase!
I wasn't talking about space, I was talking about the higher weight making the 6V6 and adapter falli out while hanging upside down.
 
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wyatt

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Good point on the space limitations. Measure b4 purchase!
I wasn't talking about space, I was talking about the higher weight making the 6V6 and adapter falling out while hanging upside down.
Both good points though.

From what I remember of the Model Two, the wider 6V6GT and the extra ~1.5" in height of the tube+ adapter is going to make it a very tight fit. It might not even fit with a replacement speaker, all depends on the frame shape.
 

HawkeyeKane

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1,325
Both good points though.

From what I remember of the Model Two, the wider 6V6GT and the extra ~1.5" in height of the tube+ adapter is going to make it a very tight fit. It might not even fit with a replacement speaker, all depends on the frame shape.
The width I'm not really concerned about....here's an underchassis shot of a Zoo Deuce. The EL84 is second tube from the left. And that's not an original OT...it's a Hammond replacement, and much larger than the OEM one.



But You're right about the tube length...the cabinet isn't original, but I built it to original specs & dimensions...



That damn alnico horseshoe is a bit obtrusive....but it's part of what makes it a Zoo...
 
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HawkeyeKane

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Actually...when I first rebuilt the cab...I very stupidly transposed the V1 and V2 tubes by accident...power tube in preamp socket and preamp tube in output socket...

No sound came from it...luckily I realized what I'd done quickly and got her shut off before anything was damaged.
 

Blue Strat

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30,199
What if I managed to get one of these adapters made with an additional 660 ohm resistor inside it on the mini-noval 3 pin?
I'd say you might be asking for trouble with both fit and possible heat issues. You also want a cap in parallel...then you'd definitely have heat and fit issues.
 

HawkeyeKane

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1,325
I'd say you might be asking for trouble with both fit and possible heat issues. You also want a cap in parallel...then you'd definitely have heat and fit issues.
I was afraid of that....dammit....ain't fair that it's easy to adapt a BQ5 to 6V6 circuit, but damn near impossible to go the other way around...
 

Blue Strat

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30,199
I was afraid of that....dammit....ain't fair that it's easy to adapt a BQ5 to 6V6 circuit, but damn near impossible to go the other way around...

So, you're saying that life isn't perfect? Who knew? ;)

Actually, thinking about Yellow Jackets...maybe it is possible. Do they still make those things? If not, why not? ;)
 

HawkeyeKane

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1,325
Actually, thinking about Yellow Jackets...maybe it is possible. Do they still make those things? If not, why not? ;)
Oh yeah....they're still making them...in several varieties actually. Some other folks are too...

http://www.yellowjacketstc.com/
http://www.vhtamp.com/products/vht-accessories/special-6-el84-adapter
http://www.tubeampdoctor.com/produc...Bone&language=en&mySID=dzOePnukBKaFrfLWA-b182

Heck, YJ even makes one that'll let you run a 6AQ5 in a 6V6 amp...
 

Blue Strat

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30,199
Oh yeah....they're still making them...in several varieties actually. Some other folks are too...

http://www.yellowjacketstc.com/
http://www.vhtamp.com/products/vht-accessories/special-6-el84-adapter
http://www.tubeampdoctor.com/produc...Bone&language=en&mySID=dzOePnukBKaFrfLWA-b182

Heck, YJ even makes one that'll let you run a 6AQ5 in a 6V6 amp...

You could probably pull this of but not in a socket the same size as the one you linked from Ebay. YJ's are a lot bigger. Weight and size will still be an issue, actually a bigger issue.
 

HawkeyeKane

Member
Messages
1,325
You could probably pull this of but not in a socket the same size as the one you linked from Ebay. YJ's are a lot bigger. Weight and size will still be an issue, actually a bigger issue.
So probably something more the size of a VHT adapter housing?



Or a YJ short perhaps?

 






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