[Amps] GS35B Amps Common Problem / few more comments

[Mark Bitterlich]

 Jim, you can buy two new 8877's for $180 each?   That is impressive.    

Yes, the socket is expensive.  Yes, the filament is at 7.5 volts at 51.5
amps, but it is also a no warm up tube so it doesn't need to sit there and
cook while you examine Spot Collector.  :-)  

The Henry 8K using the 3000 tube is large and noisy.  So is the Henry 3K,
and 2K, etc.  That being said, I ran a 3CX10000B7 that used a two speed air
handler out of a home heat pump unit. It ran low speed constantly and was
barely audible.  An exhaust air-temp probe switched it to high speed where
it got louder, but still about 1/3 of the Henry.  It all depends on design,
but no .... a 3CX3000A7 amp is not going to fit on a tabletop footprint.  So
you are correct again.  

Bottom line is that I've run about 10 different tube types in various amps
varying from 800 to 10,000 watts output in homebrew amps and I still favor
the 3000 over anything else.  It is just a tractor of a tube.  

Mark
Wa3jpy


-----Original Message-----
From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of Jim
Sent: Thursday, November 07, 2019 10:53 AM
To: amps at contesting.com
Subject: Re: [Amps] GS35B Amps Common Problem / few more comments

Add another $375.00 for a socket!

You can buy an couple of 8877s for that much. Not to mention the 386 
watt filament.

To each their own.

3xc3000 amplifiers are very large and noisy. So you have to put them in 
a separate room. Which is fine if you have that available.


Thanks
73
Jim W7RY

On 11/6/2019 7:57 PM, Jim Thomson wrote:
> Date: Wed, 6 Nov 2019 15:26:21 -0600
> From: Jim <jimw7ry at gmail.com>
> To: amps at contesting.com
> Subject: Re: [Amps] GS35B Amps Common Problem / few more comments
>
> <Agreed! 8877 is one the the BEST tubes for ham radio.
>
> <LOTS of them out there and available. Hams bought many of them for
> <spares that never got used; Because the 8877 was such a robust tube.
> <Most 8877 tubes got babied... Except for contesting... But there is
> <testimonial from K3LR's large and busy contest station below. So even in
> <a contesting environment, the 8877 goes STRONG!
>
> <8877/3CX1500A7 hard to beat!
>
> <Thanks
> <73
> <Jim W7RY
>
> ##  Buy  the cheap 8877s   while  u  can.
>
> ## ameritron  wants $1080.00  for a chinese 8877.    And an insane
$2875.00  for  an Eimac  8877.    WTF ?
>
> ##  Meanwhile a  NEW greenstone  3CX-3000A7  is  $769.95  from  henry
radio.
http://www.ebaystores.com/Henry-Radio/_i.html?_nkw=3cx3000A7&submit=Search&_
sid=13685658
>
> ##  Econco  tells  me  they  can  now  rebuild   chinese and svetlana
3cx3000A7s....  +  a ton  of  other chinese  +  svetlana   metal
triodes...and  tetrodes.
>
> ##  3CX-3000A7     50  watts  drive  =  1500w  out.   Fil  V  can  be
reduced  by 15%.   Tube  last..forever.
>
> Jim  VE7RF
>
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