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

[C E]

Hi Jerry and the group:
Let me try this amp out and I'll report back to the group on my progress.  It's still in the "testing" stage. Cal 

--- On Wed, 10/28/09, Dr. Gerald N. Johnson <geraldj at weather.net> wrote:


From: Dr. Gerald N. Johnson <geraldj at weather.net>
Subject: Re: [Collins] Need advise on diode load tube amp AC/DC
To: sdaitch at kuw.ibb.gov
Cc: collins at mailman.qth.net
Date: Wednesday, October 28, 2009, 2:46 PM


On Wed, 2009-10-28 at 21:23 +0300, sdaitch at kuw.ibb.gov wrote:
> 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.

True, though in the really old days there were magnetic cartridges that
put out volts, at the cost of short record life and poor fidelity
because they were heavy and demanded a great deal of mechanical energy
input from the needle.

Most likely the 1 tube AC/DC amp was paired with a crystal cartridge and
the quality was dubious at best. Not probably as good as the amps inside
the Collins receivers. Which negates the benefit of using the diode load
to drive the amplifier.
> 
> 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
> 

-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer

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