19-12-2016, 04:17 PM
Thanks
I'll try both triode and hexode with a DL96 style transformer and see can I get 100mW to 250mW, plenty with a decent 5" or 6" speaker and box. Or even two triodes as push pull and one hexode as phase invert and one as preamp. Basically you can bias any Hexode/Heptode/Octode etc as a Pentode.
The NOS Russian version ECH81 are cheap and plentiful, so a minimal superhet with all ECH81 might be interesting. A 12V only version (SLA or car) with a transistor or IC audio amp (or crystal earpiece) might be viable, 0V to +1V grid bias. An ECH81 is an ECH83 according to research of Radio Museum members.
I'll try both triode and hexode with a DL96 style transformer and see can I get 100mW to 250mW, plenty with a decent 5" or 6" speaker and box. Or even two triodes as push pull and one hexode as phase invert and one as preamp. Basically you can bias any Hexode/Heptode/Octode etc as a Pentode.
The NOS Russian version ECH81 are cheap and plentiful, so a minimal superhet with all ECH81 might be interesting. A 12V only version (SLA or car) with a transistor or IC audio amp (or crystal earpiece) might be viable, 0V to +1V grid bias. An ECH81 is an ECH83 according to research of Radio Museum members.
