20-08-2026, 02:22 PM
I've replaced AF117s with a Soviet military Germaniums on a Roberts.
On a Bush I found that a silicon PNP 2N3906 worked for mixer-osc and IF amp without any bias change due to emitter resistors and gain, better than the Soviet part.
Bias is tricky on transformerless totem-pole or push-pull audio out, so you usually need all the original flavour parts.
On a Bush I found that a silicon PNP 2N3906 worked for mixer-osc and IF amp without any bias change due to emitter resistors and gain, better than the Soviet part.
Bias is tricky on transformerless totem-pole or push-pull audio out, so you usually need all the original flavour parts.
