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[AMPS] New 3cx800a7 and 4cx1600b Svetlanas

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Subject: [AMPS] New 3cx800a7 and 4cx1600b Svetlanas
From: (George T. Daughters)
Date: Fri, 20 Jul 2001 08:03:05 -0700
On 20 Jul 01, at 8:53, Remigijus wrote:

> GS35B - 8877/4cx1500A7 (but they looks very different!!!!!)

I assume this is a typographical error, and should be 3cx1500a7.  
There's no way a triode (8877)is a tetrode (4cx1500a7).

> GU91B - 4CX1600A

I saw a couple of the first 4cx1600's sent over here, (they were a 
Russian number, and they had small anode cooling fins.  I think it 
was decided to enlarge the anode coolers, and call the result (for 
the western market) the 4cx1600b.  

Versions with the smaller anode cooler were electrically identical, 
but would take more airflow (=higher pressure=more noise) to keep 

> >>For what it's worth (no pun intended), the GS-23B (4CX1600) can be
> >>bought (tested and guaranteed) from "Max",,
> >>for $75 each just now (he apparently has two; not a common
> >>occurrence); the more common cost is $150 to $160 each delivered.
> >
> >
> >Seems to me a GS-23B is not the same as a 4CX1600B, but is rather a
> >4CX1600A. The "A" has an anode cooler with the diameter of a 4CX800
> >while the "B" has a cooler with a similar diamter to an 8877 or 3.34
> >inches.

This is in line with my recollection.


George T. Daughters, K6GT

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