[Collins] Need advise on diode load tube amp AC/DC

[sdaitch at kuw.ibb.gov]

Jerry,

your comment re the magnetic cartridge and its
output range rang a bell, and for the life of me,
I can't imagine an AC/DC powered amp being lined
up with a magnetic phono cartridge.

Normally, weren't magnetic cartridges much more
of a high end audio device, and were probably never
paired up with the typical low-end AC/DC powered
amp?  Seems like that would be a real mismatch
in audio capabilities.  

73
Sheldon

----- Original Message -----
From: "Dr. Gerald N. Johnson" <geraldj at weather.net>
Date: Wednesday, October 28, 2009 9:01 pm
Subject: Re: [Collins] Need advise on diode load tube amp AC/DC

> On Wed, 2009-10-28 at 07:51 -0700, C E wrote:
> > Thanks.  I initially examined the input to the amplifier. The 
> input is coupled directly to the gain control before it hits the 
> first (perhaps the only) amplification stage. Cal. 
> > 
> Then its not a magnetic cartridge. One stage takes volts, good 
> magneticcartridges put out millivolts. The diode load puts out a 
> fraction of a
> volt, expecting a couple audio stages. I think with the power problem
> needing an isolation transformer or a guaranteed ground that its 
> not a
> suitable amplifier for your proposed application.
> 
> -- 
> 73, Jerry, K0CQ, Technical Advisor to the CRA
> All content copyright Dr. Gerald N. Johnson, electrical engineer
> 
>