[ARC5] 1626 tubes

[Bob W7AVK]

Group - Interesting and fun thread.  Got to thinking about how the audio 
folks put so much stock into the transformer response, and tubes.

Years ago in the 1960s there was a singled ended tube RF linear 
amplifier published in CQ that used 12 sweep tubes in parallel.  The 
idea being with proper plate voltage and current the output impedance of 
the mass of tube was 50 or 70 ohms so no loading or impedance 
transformation was needed.  Was the first of no tune amplifiers of today 
we have learned to love.

My though some young guy could come up with such a system for audio. 
Neat way to get rid of that nasty old transformer, sell LOTS of tubes, 
[of which only you have a life time supply], and maybe even come up with 
a higher impedance line of speakers for the amplifier.

Or so, just my $0.02.  Being near 70, my hearing is so bad, I'm lucky to 
feel the audio.  :-)

73  Bob  W7AVK





fkamp at comcast.net wrote:

> With all the excitement and traffic regarding use of 1625s in audio 
> applications I would have guessed that by now someone would have found 
> the source of the interest.
> 
> A year or more ago a fellow by the name of Bob Darrielak built an audio 
> amp using 1625s as output tubes.  He called it the Darling amp.
> 
> No, I am not making this up, honest.
> 
> Having most of the parts needed, I built my version of the darling amp.  
> You can see it at > http://www.k5dkz.com/1626.html
> 
> Is it better than any audio amp I have ever used?  No, but it does work 
> well and drives a set of bookshelf speakers to earsplitting volume with 
> no hint of distortion.  At least nothing I recoqnize as distortion.
> 
> Regards,
> Frank Kamp
> K5DKZ
> 
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