I have come across v-m reel to reels a lot,on my second 720,that comes with 6l6gb,4x12ax7,2x12au7,5y3,the first is in a converted Marshall lead 12..still waiting to be wired up but picking out a schematic to run with is let's say...slim,what's everyone's opinion on this tube..I am a rookie but learning..lol
Guitar amp threads really belong in Instruments & Amps so I'll move it there.
The only important issue is that the GB is rated for 19W plate dissipation and the GC for 30W. They're find to use if you understand that you cannot just put them in a GC circuit.
Amp makers used what was current at the time. Go far enough back, and the 6L6s of the day were the B revision. Modern 6L6 tubes are the C revision. Anywhere a 6L6GB was, a 6L6GC will work just fine.
There are current production tubes labelled 6L6GB, but they are pretty much just more 6L6 of today, in other words, they do not fit the data sheets from 60 years ago.
So if you are looking for a circuit that says 6L6GB on the schematic to emulate, don't bother. Pick any 6L6 circuit you like, and it will be fine.
If you are looking to use old 6L6GB tubes, then just be aware of their limitations and don't drive the heck out of them.
There are current production tubes labelled 6L6GB, but they are pretty much just more 6L6 of today, in other words, they do not fit the data sheets from 60 years ago.
So if you are looking for a circuit that says 6L6GB on the schematic to emulate, don't bother. Pick any 6L6 circuit you like, and it will be fine.
If you are looking to use old 6L6GB tubes, then just be aware of their limitations and don't drive the heck out of them.
Just use the tape deck output and power transformers in the new amp design. A little more voltage (using ss rectification) and/or less feedback can loosen up the output stage without going into a territory that will destroy your valves. Most of the tone and distortion comes from the preamp stages and speakers anyway.
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