Good comments here Bob; you've nailed some relevant points here. The GS35B does indeed need a higher plate voltage / plate load impedance to achieve parity in efficiency with the 8877; complaining ab
Good comments here Bob; you've nailed some relevant points here. The GS35B does indeed need a higher plate voltage / plate load impedance to achieve parity in efficiency with the 8877; complaining ab
REPLY: "Splitting hairs"? If you call an extra 500 watts DC in to get the same RF out and almost double the drive "splitting hairs", then I guess so. 73, Bill W6WRT __________________________________
Or, consider re-buildable directly-heated cathode types that may, or already have, gone out of production, but where sufficient usage across industries will keep rebuilders like Econco and Zonum in b
Hi Bill, But my point here was that if you design the tank circuit for a higher plate voltage and plate load impedance then you won't have to take a hit on the efficiency. As Jim reported in his repl
So the gain and efficiency go up but so does the cost of the PS and tank components. Use a good tube to start with, learn how to build fault circuits and enjoy life. I wouldnt want to be in the same
With the air variables most problems are with the rotor contacts, better to use split-stator but used as load capacitors they become too bulky. Two years ago I had a problem on 10m with the vacuum an
The OEP brand caps that most all the amp companies buy have always had poor rotor contacts. They now have 3 different levels of current handling but what Ive seen used is still the cheapest. Dont kno
So the gain and efficiency go up but so does the cost of the PS and tank components. Use a good tube to start with, learn how to build fault circuits and enjoy life. I wouldnt want to be in the same
REPLY: Achieving 61% efficiency is good enough, but at 4.1 kVDC you will be exceeding the manufacturer's ratings. The data sheet says absolute maximum instantaneous peak anode voltage is 6 kV and you
REPLY: I noticed the specs for the GS-35b don't specify a recommended CFM for cooling but they do say the maximum temp for cathode and grid leads is only 120 degrees C. That's pretty low compared to
REPLY: The only failures I've had with vacuum caps were of the glass type, leaking air. I'd stick with ceramic. 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@c
REPLY: One neat thing about cooling a GS-35b is that a replacement glass for a Coleman lantern fits over it perfectly. Just glue the glass to the chassis with a few dabs of silicon RTV and you're rea
Physical Characteristics Envelope metal-ceramic Cooling forced air Minimum required Air flow 2500 l/min (83.3 cfm)** Diameter 100.2 mm max Length min 173 max 177mm (6.9") Anode Diameter min 99.7 max
Well shoot .... I hit 94cfm ... and yea, its noisy. Im sure the fan noise is lower at 83cfm... _______________________________________________ Amps mailing list Amps@contesting.com http://lists.conte
Hi All, It is Russian PA with 2 GS35b built by UA6HN in 1985: http://www.cqham.ru/foto/showphoto.php?photo=761&title=-d5-ce-d0-ce-d8-cecf-ce-cc-ce-c3-c0-cb&cat=500 It worked during 10 years without e
Fancy machine work, solder the filament leads to the tubes! Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinf
REPLY: How would you do that without exceeding the seal temperature? 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m
BIG iron, clean metal, flux, get in/get out. It would need to be almost instantaneous. Couple secs max. 73 de Steve, NR4M _______________________________________________ Amps mailing list Amps@contes
REPLY: Too risky for my taste. Make a clamp. Even alligator clips. :-) 73, Bill W6WRT _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com