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Old 3rd Dec 2022, 11:09 pm   #5
Bazz4CQJ
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Join Date: Apr 2009
Location: Oxfordshire, UK.
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Default Re: AVO instructions for creating a standardised valve.

The instructions for the 163 call up (on page 1) the use of an E55L, supplied by Avo. Seems like you must be referring to an earlier model.

New E55L's seem to be priced at ~£250 each on eBay, so I'll give those a miss. Very high Gm if I recall.

Avo haven't specified the pot because they haven't specified the PSU for the grid voltage; just needs to be the right pairing to give fine enough control in the right Vg region for the two valves. If you have a decent psu, you may not need a pot but a fixed resistor would do.
Be sure to burn-in a brand new valve for at least 24 hours before standardising; some change l a lot.
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Last edited by Bazz4CQJ; 3rd Dec 2022 at 11:18 pm. Reason: over-lapping posts
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