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   Home   Help Search  
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Author Topic: Cost of Building an HF Amplifier?  (Read 1310 times)
G3RZP
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Posts: 808




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« Reply #15 on: February 11, 2019, 04:45:18 AM »

You can often get given parts. We (G4FNC and myself) got two vacuum variables as wedding gifts.......
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LA9XNA
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« Reply #16 on: February 11, 2019, 02:07:22 PM »

You can look for a "Donor amp" and use that as a starting point.
This will give you many of the components required to get started.
The most important is probably the voltage and amps on the HV transformer to fit with the tubes you plan to use.
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W1VT
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« Reply #17 on: February 11, 2019, 04:08:43 PM »

Cockcroft-Walton cascade may not be suitable for typical SSB operation with its high peak to average ratio.  Similarly, the pure tone of traditional CW may be hard to achieve with a cascade.
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MM0IMC
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« Reply #18 on: February 12, 2019, 04:11:55 AM »

It's difficult to know where to start, as I've a fair collection of Russian NOS valves to choose from.  Roll Eyes I've got a GS35B, a couple of GS31B's, a couple GI7B's and a GI46B.

I've been advised in the past to stay away from microwave oven transformers. I do have ten Chinese 450V, 220 microFarad electrolytic caps I could use. I've also got a separate transformer that would be good for use as a heater transformer and would easily accommodate the largest Russian valve.
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PU2OZT
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« Reply #19 on: February 12, 2019, 05:35:36 AM »

CW cascade may not be suitable for... CW...

That was a good one I sure remember when taking my Extra
 Grin Grin
Oliver
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N8FVJ
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« Reply #20 on: February 13, 2019, 06:20:55 AM »

I suspect some used amplifiers would be cheaper than the cost of building a new amplifier.
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WA5VGO
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Posts: 58




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« Reply #21 on: February 13, 2019, 07:22:55 AM »

It’s not all about cost. It’s also about pride and the learning experience.

Darrell
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K3UIM
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Posts: 225




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« Reply #22 on: February 13, 2019, 09:51:40 PM »

Amen, Darrel, although I'm thinking not too many of todays hams are doing very much building. (Mores the pity!)
Seems that back in the 50's and 60's we didn't have the necessary bucks to do a lot of buying so learned to enjoy the thrill of building and learning.
(Judas Priest! I'm aging as I type!!) Hi.
Charlie, K3UIM
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