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Jim, is there public domain software program that helps with Pi network design? aka, I'm looking at 8877 50Mhz project in 2024 73 Robert W5AJ

What does the piece of Heliax do?

Try a 3/4 wavelength stripline. Get the design info from W6GGV's articles published in the Nov. '80, and Jan. through April '81 issues of Ham Radio. Steve, K0XP

A pi-circuit 73 Peter, DJ7WW -----Original-Nachricht----- Betreff: [ham-amplifiers] 144 mhz tuned input for a GG YC-156 ?? Datum: 2024-01-05T20:51:29+0100 Von: "Jim VE7RF" <jim.thom@...> An:

Jim, are you building this?

YC-156 is good up to 150 mhz.? ? It will be used on 144 mhz. Yes, the 8877 has a 38.5 pf? between cathode and grid....and is good up to 250 mhz. Question is.... how the hell do u make a tuned input

Yes, that's 2 1/2 times the value for a 8877 that works good up to 222. Will this tube go that high?

Ok, how does one go about building a tuned input for a 144 mhz amp, using a YC-156 tube ? The input C on the YC-156 is huge,? 92.5 pf? ?( grid to cathode). This is for a cathode driven? ?YC-156 (

KB1SEL got the premade chassis and cabinet from ICA manufacturing in? NJ.? They come completely pre-fabricated and ship flat. All you do is assemble with machine screws. On most of em, they have the

Keep in mind that sometimes, paying somewhat more for the chassis can make up for a lower shipping cost, too. Compromise, compromise, compromise... Steve, K0XP

The Amp Repair guy has a few videos on Utube constructing a few amps. He purchase his chassis ready made. Check Utube for the name of the supplier. And yes there are metal suppliers listed on the web.

My little local town has Al. supplier who will guillotine pieces to size for free If the order is over ?10.... I expect most towns will have similar. I never bend pieces (although my Al. supplier can

What's good choice for obtaining Aluminum plate, Aluminum Chassis.. I'm searching ebay, lots of picks.? Others? Short story, About to cannibalize old amp for chassis but think NEW would turn out

It seems fine, I suppose, even above SRF, it's only a few nH.... and is still a DC block ;-) The Gi46b runs low power as a driver for the final triode so has a pretty easy life.

4x HT50 or 55 do well on 2m with 4CX1000/3CX1500A7 amps. GI7b and similar tubes drift when cooling is insufficient. 73 Peter -----Original-Nachricht----- Betreff: Re: [ham-amplifiers] Gi46b on 2m -

For the OP, does that plate block cap even look like a cap at? 144 mhz ??? ?Will it handle the calculated rf current flowing through it at 144 mhz ? John Lyles,? K5PRO helped myself and Scott out

Glad it’s fixed, Tim. Have fun with it !

I recently acquired a British KW1000 linear which uses a pair of 572Bs and is somewhat similar to the SB200. The power transformer was missing but I have been able to fit a replacement from the junk

I'm not sure if this is in reference to my picture or not, but if so the camera may be playing tricks on you. The teflon I'm using is .4mm thick (in fact it's not even teflon in that mock up, it's a

Sorted! Changed the blocking cap and replaced the muffin fan with a blower big enough for a GS35. Power 350W drifts down to 330W after about 30 seconds, but that could just be the driver power