Bottles like the 4-1000A thrive on such high plate voltages, but the internal close-spaced electrode construction of the GS35B (designed for UHF service) with its oxide coated indirectly heated catho
Author: gudguyham--- via Amps <amps@contesting.com>
Date: Thu, 31 Oct 2019 13:04:48 +0000 (UTC)
Tony King has comprehensive data on this tube on his webpage. It is interesting to note that the data sheet actually calls out a degradation of performance of the tube running on a frequency of 60cm
I concur with your comparative assessment of the three tube types here Lou. The 8877 is the indisputable ?gold standard? for QRO ham amplifier triodes?.its a pity it is now so damn expensive :-( To e
The "Gold Standard" tube is the 3CX3000A7 which has about the best IMD even at full HV. Throttle down to a mere 3000W and it defies detection on the bands. A 100W rig will drive it to a loafing 1500W
You may be a bit harsh, Carl! Ive 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 s
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 out
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
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 ball
Doubling the voltage. The 76 voltage is too low for the 8877. 73 Bill K5FUV Sent from Yahoo Mail for iPad Okay....I'll be stupid.... Besides the filament voltage and socket, what else would it take
Right. That is why the 3cx800 works so well here. 3cx800 is also a GREAT tube. I use both the 8877 and a pair of 3cx800s in my homebrew amplifiers. Sent from my wireless communicator 73 Jim W7RY 3cx8
Author: mark bitterlich <markbitterlich@embarqmail.com>
Date: Wed, 06 Nov 2019 18:52:57 -0500
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
The grid on the 3000 is indestructible where the 8877 needs good protection. On the other hand, the output C of the '3000 is quite a bit higher than the 8877 (about 25 pf vs 10 pf) and for a guy coo
A taller cabinet and I would suggest a heftier blower. 73, Alek. VK6APK Besides the filament voltage and socket, what else would it take to convert something like a 3 tube Alpha 76 to a single 8877 ?
<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
<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 t
I think it might fit, just about, There is about 73mm clearance from the tops of the 8874's to the cabinet of the 78. The 8877 measures about 43mm taller than the tiny 8874. so there would still be a
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 pu
<The grid on the 3000 is indestructible where the 8877 needs good <protection.? On the other hand, the output C of the '3000 is quite a bit <higher than the 8877 (about 25 pf vs 10 pf) and for a guy
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