[LCC] Amplifier

[Marshall-K5QE]

Hi Charlie and the rest of the LCC....RR....I have several of the GU74b 
tubes.  I bought them when I thought that I was going to start building 
again, but due to my failing health, that is probably not going to 
happen.   I purchased them direct from Pavel Popov in St. Petersburg 
when he was selling the Russian tubes for a living.

I paid $100 each + shipping from Russia.  I would sell them all to you 
for $85 each + shipping.  I don't know exactly how many I have, but it 
should be more than 4 and less than 10...just a guess, since I have not 
counted them in a long time.

I also have several of the other high power Russian tubes...such as the 
GS35b and the GS31b(triodes) and the GS23b which is a tetrode.  I have a 
bunch of the medium power tubes, specifically the GI7b and the newer and 
much better GI46b.  I also have a smattering of other tubes.  If any of 
this is interesting, please let me know.

If you ever did have to replace the 3CX1200 tube, a GS35b or GS31b would 
be more than adequate.  Of course, you would have to fashion a "socket" 
for these tubes, but that is easy, since all you have to do is to clamp 
them to the chassis with some metal clips.

The best reference on the Russian Tubes is http://www.nd2x.com/ It is 
loaded with amp designs and tube specs.  GL...

73 Marshall K5QE
Phone is 409-787-3830 if you want to talk....


On 12/13/2017 8:42 PM, Charles Morrison wrote:
> The 1200 is a workhorse of an amp with the simplicity needed to work on it
> yourself.  The 3CX1200 in that amplifier is expensive but tough as nails.
> Treat it right an you'll never have to replace it.  The 91b is an EXCELLENT
> amp and has 2 4cx800/gu74b's.  They WERE cheap at one time, but not so much
> any longer (but not near as expensive as the 1200 or 8877's or especially
> 8874's for the Alpha 76/78 owners out there).  But they ARE new old stock
> now.   Add that to the uncertainty of Alpha the company.  Is Dishtronix
> working on the 91b?  Can you fix the 91b yourself (surface mount IC's,
> etc?).  The 1200 can be repaired by almost anyone with a small amount of
> soldering knowledge.  I've already changed the relay, bleeders and filter
> caps in my 1500, piece of cake.  If I had to work on my Alpha 99, anything
> beyond the high voltage or the tube, I'd probably be lost.
>
> Stick with the 1200 unless its low on power and you don't want to buy a
> tube.  No need to inherit the uncertainty of the 91b.  I have a spare set of
> GU74's, but they're getting old.  I gettered them about a year ago, ran the
> heaters without the HV, hopefully to keep them in tact until called to
> duty.. but perhaps never?
>
> My 2cents.
>
> Charlie
> N5WE
>
>
> -----Original Message-----
> From: LCC [mailto:lcc-bounces at louisianacontestclub.org] On Behalf Of
> w5wz at w5wz.com
> Sent: Wednesday, December 13, 2017 4:00 PM
> To: lcc at louisianacontestclub.org
> Subject: [LCC] Amplifier
>
> Hi guys,
>
> I've currently got an AL-1500 and an AL-1200.  They both serve me well.
> However, I've just learned of an Alpha 91b available for sale at what seems
> to me a bargain price of $2,400.  If I do this, I'd likely offer the AL-1200
> for sale.
>
> What do you guys think?  Stay with what I've got, or go for the Alpha ?
>
> --Scott
>
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>
>
>
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>

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