Brendan
Joined: Jul 06, 2006
Posts: 36
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Posted on May 11 2011 10:57 AM
I picked up a used Guyatone reverb unit at a good price yesterday. I was surprised to see a NOS 6V6GT installed since the company literature mentions a 6K6GT tube. I asked Guyatone for a schematic and it shows 6V6GT.
I've been doing some searching for info on swapping a 6K6GT for a 6V6GT and there seems to be a few opinions out there that state it shouldn't be done because the 6K6GT isn't as strong at a 6V6GT. The Guyatone schematic does not have voltages listed, so I'm not sure if this applies. I would like to give this a try. Would anyone here recommend against using the 6K6GT in this unit?
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Stormtiger
Joined: Dec 12, 2006
Posts: 2688
Ventura, CA
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Posted on May 11 2011 11:48 AM
The reissue Fender reverb units come with a 6V6 but many, including me replace it with a 6K6 which cuts down the treble bite. The 6K6 tubes are no longer in production so they didn't make them stock but they are still plentiful and inexpensive.
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Bill_Ashton
Joined: Nov 15, 2008
Posts: 124
Massachusetts
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Posted on May 23 2011 08:02 PM
Well, probably too late now, but I might caution against using a 6K6 tube in place of a 6V6 in a modern piece of equipment.
The 6K6 was essentially an AM car radio tube from the 1950's...perhaps I exaggerate, but not much. The 6V6 was a higher powered amplifier tube and as such (while not having consulted a tube manual) may normally run on higher voltages. 6K6 may sound blissful for a while then burn out...or just burn out.
While I don't know the exact circuit the Guyatone uses, I might use the analogy that one must be careful when selecting 6V6 tubes for a Fender Deluxe Reverb...some of the Soviet one cannot withstand the voltages the DR will run them at.
If you tried the switch, I hope it works out for you.
— Of all the things I've lost, I miss my mind the most...
Last edited: May 23, 2011 20:03:19
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Brendan
Joined: Jul 06, 2006
Posts: 36
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Posted on May 26 2011 12:55 AM
Thanks. I did find some more info after posting and I considered the differences. I also contacted the US distributor of Guyatone and the person responding seemed to think the two were interchangeable in this unit. I took a chance and picked up two NOS 6K6 GTs for $10 from Ebay and I have one in there now. I figured if it burnt out, I'm not out much and can always pop the 6V6 GT back in. It sounds great and a hell of a deal for $315 shipped. This is my first tank and I wish I hadn't waited so long.
I also recovered the black tolex front panel with "Fenderish" grill cloth. 
Last edited: May 26, 2011 00:59:23
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Bill_Ashton
Joined: Nov 15, 2008
Posts: 124
Massachusetts
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Posted on May 26 2011 07:20 AM
Glad that it worked out for you!
As we say on another board, "It didn't happen without pictures" 
Lets see your new baby...
— Of all the things I've lost, I miss my mind the most...
Last edited: May 26, 2011 07:21:11
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Brendan
Joined: Jul 06, 2006
Posts: 36
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Posted on May 28 2011 09:52 AM
Still working on low budget ideas to ditch the yellow faceplate.
Last edited: May 28, 2011 09:52:45
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Bill_Ashton
Joined: Nov 15, 2008
Posts: 124
Massachusetts
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Posted on May 28 2011 12:46 PM
Hmmm, all I can see (budget not-withstanding) is perhaps Marshall or maybe Dr. Z...possibly a Vox 700-series? None particularly surf-like 
— Of all the things I've lost, I miss my mind the most...
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remora1
Joined: Jan 04, 2008
Posts: 1278
San Pedro, CA
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Posted on May 31 2011 01:12 PM
Brendan wrote:
Still working on low budget ideas to ditch the yellow
faceplate.
I covered mine with a thin piece of stainless steel shimstock -
— Bill S._______
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MadScientist
Joined: Jan 17, 2008
Posts: 2188
Atlanta, GA
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Posted on May 31 2011 02:34 PM
Brendan wrote:
Still working on low budget ideas to ditch the yellow
faceplate.
I have to recommend www.amplates.com. I used them and am very happy with what they did. It's probably not going to be "low budget" but shouldn't be too bad. Worth looking into regardless.
Good hunting!
—
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