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Original Message
RE: First stage phono preamp transformer output coupled
Posted by d888sp4@gmail.com on March 7, 2017 at 00:27:30:
Hi Kevin,
in my design 7788 is triode strapped, bias is around Va=140V, Ip=30mA, with Rp=10k to get max transconductance (50mA/V) that gives a total gain around 40 (32dB).
LCR RIAA network 600ohm is the load on secondary trasformer. With 4:1 transformer it is reflect to primary around 10k that match 7788 Rp needed.
My reasoning is that correct?
LL1692A/30mA version is in stock or is a special order version ?
What do you think about LL1660/30mA version 4.5:1 connection (100H) in my SE ?
Thanks.
Best regards.