While soldering changed schematics significantly.
Now pentodes are loaded on CCSs with servos, G2 voltage for them taken from 150V gas discharge lamp through a source follower (one more gas discharge lamp in series gives 105 more, so plate voltage for preamps and drivers is +250V now -- more than enough).
Now pentodes are loaded on CCSs with servos, G2 voltage for them taken from 150V gas discharge lamp through a source follower (one more gas discharge lamp in series gives 105 more, so plate voltage for preamps and drivers is +250V now -- more than enough).
Was that case originally a piece of Marconi test equipment? There's something familiar about it...
EC8010 said:
Yes, it was Marconi Instruments noise generator.
A small chassis was a 430 MB hard drive.
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