Quote:
Originally Posted by Bazz4CQJ
A similar ECC85 cascode circuit appeared in SWM for the HRO replacing the original 6D6 1st RF B
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The 1960s SWM circuit I built utilised a plug-in adapter arrangement for substituting the ECC85 into the 6D6 1st RF amplifier socket. It certainly gave consistent gain up through 21 and 28 Mc/s, whereas the original valve tailed off a bit at higher frequencies.
- Peter