Re: attn: Chris Hornbeck and Patrick Turner Re: A question (6CA7 bias current)

Bart:

I have a rebuilt-to-stock ST-70 (excepting the silicon diode ILO the
selenium), and both sets of EL34 and 6CA7 tubes NIB and 'well-used'.

Let me know where you took your measurements and I will try to
duplicate them, if for no other reason than to try to determine which
of your two units is the outlyer. Did you read right off the Bias Point
or somewhere else? I will be measuring with a Fluke true-rms DMM.

I am sure that you are aware that the 5AR4/GZ34 is what is called a
'soft-start' rectifier. It can be replaced with diodes, but that
soft-start option should also be duplicated. There are several sources
for SS drop-in replacements that duplicate the action for far less than
a NOS US/UK unit.

Peter Wieck
Wyncote, PA

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