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Re: [Amps] GS35B Amps Common Problem / few more comments

To: amps@contesting.com
Subject: Re: [Amps] GS35B Amps Common Problem / few more comments
From: Steve London <n2icarrl@gmail.com>
Reply-to: n2ic@arrl.net
Date: Wed, 6 Nov 2019 14:48:24 -0700
List-post: <mailto:amps@contesting.com>
Okay....I'll be stupid....

Besides the filament voltage and socket, what else would it take to convert something like a 3 tube Alpha 76 to a single 8877 ? Seems like the output Z is in the right ballpark.

73,
Steve, N2IC

On 11/06/2019 02:26 PM, Jim wrote:
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

On 11/5/2019 8:34 PM, Tim Duffy wrote:
Hello Jim,

I agree - the 8877 - 3CX1500 is a VERY good Ham Radio tube. I have several in service here at K3LR that are 30 years plus years old. 18 amplifiers here using 8877s that make 1500 watts output RTTY with high TX duty cycle - no problem - all the way to 220 MHz!

The 8877 is an excellent engineered tube for amateur radio - easy to build amplifiers with the 3CX1500A7.

73
Tim K3LR

-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of MU 4CX250B
Sent: Tuesday, November 5, 2019 9:12 PM
To: Carl
Cc: amps@contesting.com
Subject: Re: [Amps] GS35B Amps Common Problem / few more comments

You may be a bit harsh, Carl!  I’ve lost two 8877s  in the past half
century or so, and it was my fault both times. The first was when I
stupidly let the filament voltage drop way below specs, and the second
was when the blower on my Alpha 9500 failed and I didn’t notice for
two weeks. My workhorse homebrew amp, built in the 1970s, has an Eimac
8877 with a 1978 date code. Still full output, 4300V on the anode.
73,
Jim w8zr

Sent from my iPhone

The 8877 is a fragile short life wannabee befitting an oxide cathode tube


Carl


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