While I totally agree that the 8877 is a great tube, and has been used
successfully in many great amp designs both commercial and homebrew, I
personally agree with Carl. The 3CX3000A7 gives the best performance, dollar
per watt, than any other tube I've ever had experience with. Only a very few
ham radio amps used it, so possibly not as many hams have had experience with
it. Wa3jpy
-------- Original message --------From: Jim <jimw7ry@gmail.com> Date: 11/6/19
16:26 (GMT-05:00) To: amps@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!Thanks73Jim
W7RYOn 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>>>>> _______________________________________________> Amps
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