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6L6GBs


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5/14/2000 3:37 PM
Joe D
6L6GBs
I recently came across some RCA black plate 6L6GBs. Has anyone used these in a guitar amp?What's the differance between these and 6L6GCs?  
Joe D
 
5/14/2000 10:44 PM
Tremo
Joe,  
 
The GB will have lower maximum ratings relative to the GC.
 
5/15/2000 5:28 AM
Joe D

Tremo;  
Any idea how they would sound for guitar?  
Joe D
 
5/15/2000 11:45 AM
Casey4s

A NOS 6L6GB as I understand it is essentially the same as a 6L6Wgb. The "W" affix on most tubes was for "JAN" designated tubes. A 12AX7WA is a JAN 12AX7A, for example. So a 6L6GB is is actually the same thing as a 6L6WGB/5881. So you you would treat it like a 5881. As faor as sound, they will have less headroom than a GC with earlier breakup. If you are talking about New Production tubes, like a Sovtek or Groovie Tube 6L6GB, I have no idea if this is true.  
 
Casey4s
 
5/15/2000 4:09 PM
Jim S.

A true NOS 6L6GB is rated for only 19 watts max. plate dissipation and (IIRC) 400 volts on the plate. I don't recommend using these in blackface and later Fender amps. They are OK for lower-powered Fender Tweed amps (but not Tweed Bassman).  
 
A NOS 5881/6L6WGB (small bottle) is rated for 23 watts max. plate dissipation. These work OK in most Fender amps.  
 
A true 6L6GC is rated for 30 watts max. plate dissipation.
 
5/16/2000 4:20 PM
Joe D

Thanks Jim, I guess I'll leave them in the power supply where I found them. I have a tweed Pro and it sounds like these wouldn't cut it in there.They are true 6L6GBs, large bottle RCA black plates.  
Joe D
 
5/16/2000 6:36 PM
Jim S.

They would probably work OK in a Tweed Pro, even taking into account that plate voltages are going to be a bit higher now due to line voltages being usually around 120VAC instead of the 110VAC that was commonplace 40-50 years ago. In fact, 6L6GB was the stock tube in earlier Pros (first narrow panel ones came out in 1955). I think they later came with Tung-Sol 5881's as did the Bassmans.  
 
I definitely wouldn't use 6L6GB in an amp that put more than 450 volts on the plates, however.
 

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