A taller cabinet and I would suggest a heftier blower.
73, Alek.
VK6APK
On 7/11/2019 5:48 AM, Steve London wrote:
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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