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Post subject: Yellow Jacket tube converters
Posted: Sat Feb 19, 2011 7:52 am
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Just curious if anyone has tried these particulair ones and what your
experience with them was like?

http://www.amplifiedparts.com/tech_corn ... nformation

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Post subject: Re: Yellow Jacket tube converters
Posted: Sun Feb 20, 2011 7:42 am
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Bump for the Sunday crowd...

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Post subject: Re: Yellow Jacket tube converters
Posted: Mon Feb 21, 2011 3:58 am
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Well, I may be the first....maybe :?:

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Post subject: Re: Yellow Jacket tube converters
Posted: Mon Feb 21, 2011 4:29 am
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From another guitar amp board:

An amp with a 6V6 output tube needs more than just a socket adapter to use EL84 tubes. The converters are more than just a octal plug to noval socket re-wire. Operating conditions for 6V6 and EL84 are quite different, especially the required bias. So as well as the right connections, there would be a cathode bias resistor and screen grid resistor in the converter as well. Here's part of the description from the AES site:

"This Yellow Jacket converter is a specialized adapter which permits the use of EL84/6BQ5 power tubes in place of 6V6 type tubes. Yellow Jacket converters not only re-arrange the pin locations of the tubes but also provide the necessary current limiting on the screens and cathode. Yellow Jacketss block the amplifier's grid bias voltage, which configures the EL84/6BQ5 into a class A self adjusting bias circuit"

There are several tubes with operating characteristics identical to 6V6. These include 7C5 (loctal), 6AQ5 / EL90 (B7G) and 6BW6 (B9A). An adapter to use these types is simply wired socket to octal plug, no extra bits required. I have used 7C5 and 6AQ5 in a Fender Princeton with good results.

If you want a suitable octal base to make an adapter, just smash a dud octal tube, clean out all the gunk inside and de-solder the pins. Then solder wires to the socket and thread them through the correct pins in the octal base. Solder it all up, check for continuity and shorts and fill the base with some RTV or similar compound.

David Crittle
critter@retrovox.com.au


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Post subject: Re: Yellow Jacket tube converters
Posted: Mon Feb 21, 2011 12:12 pm
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I have used them in a HRDLx. They worked exactly as one would espect from EL84s. They made the amp brighter and brought the power down a bit causing it to breakup sooner at gig levels. You can't tell the reduced power at bedroom levels.

They are super easy to use; just plug them in and have at it. No biasing required. Want to go back to your original tubes, unplug the yellow jackets and put your originals back in. Again, no biasing necessary.

I sold mine because I have numerous el84 amps, and the hot rod is the only 6L6 amp I have, so I really didn't need them. If I had just the hot rod, I would have definitely kept them as they make it easy to get a change up in tone.


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Post subject: Re: Yellow Jacket tube converters
Posted: Mon Feb 21, 2011 12:20 pm
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prolux wrote:
I have used them in a HRDLx. They worked exactly as one would espect from EL84s. They made the amp brighter and brought the power down a bit causing it to breakup sooner at gig levels. You can't tell the reduced power at bedroom levels.

They are super easy to use; just plug them in and have at it. No biasing required. Want to go back to your original tubes, unplug the yellow jackets and put your originals back in. Again, no biasing necessary.

I sold mine because I have numerous el84 amps, and the hot rod is the only 6L6 amp I have, so I really didn't need them. If I had just the hot rod, I would have definitely kept them as they make it easy to get a change up in tone.


Thanks!

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Post subject: Re: Yellow Jacket tube converters
Posted: Mon Feb 21, 2011 1:04 pm
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Just make sure that the filament current and Idle bias are compatible :wink:
8)

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