Re: Warm start options



> > In the past I have uses a mechanical timer relay
> > on the secondary of the mains transformer
> > before the FWB, or a DLS16, a neat octal
> > thermal relay which glows incandescently for
> > about 45secs before closing.
> >
> > I like the idea of a relay which would not switch the HT
> > at all, but be used to keep the bias for the output valves/
> > tubes at say -80V until the cathodes were warm.
> >

I like to have separate heater and B+ supplies on their own switch,
but wired so that you cannot have B+ without heater first. Derive the
bias from the heater supply so as long as you have heater voltage you
have bias.

If you want to get fancy you can use a rotary switch. I saw one setup
that used a four way switch for a coin-op clothesdryer, available for a
few dollars from any appliance store. I think it might have been in the
old "Sound Practices" or "Glass Audio". I just use two toggle switches
myself. The split rocker used for parking and head lights in GM cars,
or the BAT and ALT master switch in Cessna aircraft, would work ok too.
They are DC rated but will actually work fine on 115 VAC at these
currents.

.

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