01-07-2018, 06:42 PM
Can I safely substitute a 6V6G (or 6V6GT) tube for a 6F6G tube in a 37-630T radio ? I've read that the current draw might be different so I'm not sure this would work?
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Sub for 6F6G tube
01-07-2018, 08:15 PM
In pushpull output it is not recommended to sb 6f6 for 6v6.
OK for SE outputs. People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing. 
01-07-2018, 09:31 PM
The '630 has a single output tube so your good.
When my pals were reading comic books I was down in the basement in my dad's workshop. Perusing his Sam's Photofoacts Vol 1-50 admiring the old set and trying to figure out what all those squiggly meant. Circa 1966 Now I think I've got! Terry
01-08-2018, 12:21 AM
The 6V6/6V6/6V6GT is actually a good, if not better substitute for a 6F6 or 6F6G, but it depends on how the original tube was biased. If the original tube, or tubes in the case of a push pull output stage, are cathode biased (or self biased) then you can use either tube type, but if the tubes use fixed bias then some circuit modification will have to be done as each tube requires a different bias voltage. I don't know which sort of biasing was used in the 37-630, one way to tell is if there is a resistor connected between the cathode of the 6F6G tube and B-, if it has then it is cathode biased, if not then it's fixed biased.
Regards Arran
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