[sdiy] sort of OT: Ward Airline phono input test: success!

[Barry Klein]

I have a cool looking Bendix Marine radio all tube, probably from the 50's,
anyone got something good to trade for it??  

Only thing is you need to get an isolation transformer for the thing.  Two
conductor AC cord and the chassis can give you a nasty shock...  Watch out
for this on what you are working on.

Barry


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Travis Shire
Sent: Monday, November 05, 2007 5:25 PM
To: anthony; synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] sort of OT: Ward Airline phono input test: success!


> So I cleaned up that neat looking Ward Airline radio's chassis, changed
some
> caps and plugged my guitar through a hotrodded Peavey Hotfoot into the
phono
> input of the radio. It's weird, it actually sounds like the AGC is working
> even when you're running it through the phono input - I got LOTS of
> disortion but not extra volume from the Hotfoot. It does sort of make
sense
> though since the only preamp stage between the 6V6GT and the phono input
was
> a 6AV6 hi-mu triode/dual diode - all sharing a common cathode. I'm pretty
> sure the diodes are for the AGC since there's a 6AL5 that I'm pretty sure
is
> being used as the detector here (since this is an AM/FM radio). Hooking
the
> amp straight through sounded nice and clean, but not much break-up since
> there was only 1 triode gain stage.
>

The phono input will have RIAA EQ...you don't wanna use that. Strip it and
redo it with a more guitar friendly circuit. You'll only need a cathode
follower if you choose to use a Mar$hall type tone stack. If you just want a
high cut control, you can run that right off a plate (after coupling cap).

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