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hi folks,
any information available which maximum anode voltage a vintage TOSHIBA 6GB8 can safely handle without harm?
a buddy wants to try them in his vellemann EL34 amp that works at 450 V (pretty high even for EL34...).
thanx!
Nunki
Follow Ups:
As others have noted, the 6G-B8s should work fine with but too much gain for the Velleman amp circuit. IMHO those 6G-B8 are rare and should be preserved for the amps that required them. Your friend can likely get very good prices for those by selling to people that really need them, and buy twice the number of any EL34, 6CA7 or KT77 he likes.
BTW, if you go ahead, do check the screen voltage in the Velleman circuit before the switch. I don't read Japanese, but based on the datasheet it appears that the max screen voltage on the 6G-B8 is 400V.
6G-B8 run at 700V fine, and test 40-42W without red plate.
Gain is 50% higher than EL34.
Indestructible compared with EL34.
I have a pair in my MO100A running at 635V with A-A 4750 Ohm.
You could look here for the datasheet.
It sucks to get old. It really sucks to get old and bitter.
thanks mike!
IF 6GB8 and 8417 were comparable, 660 volts should be the limit then.
N.
The data sheet isn't in english, but you can draw your own conclusions... this is a VERY robust tube, way more so than the EL34Check that out, 130W from a pair with 700V on the plates! Wow.
Edits: 07/16/21
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