Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
Member Login

Posted: 12/16/2016 11:40:32 PM EST
Toying with the idea of building a new RF amplifier.

Wondering about what others here may be using and how well they liked the current build that they are using.

Poll to follow.
Link Posted: 12/17/2016 7:08:32 AM EST
I built a 3-1000 amp a long, long time ago. Had a lot of fun accumulating the components (tube, socket, chimney, vacuum variable capacitors and whatever-they-call-them-hand-cranks, humungo power supply transformer, edge-wound inductor, gigundo ceramic bandswitch, awesome voltage, current meters, etc.).

Plusses: Big, big signal. Kept the room warm in the wintertime. Enjoyed the cherry red glow from the plate.

Biggest downsides: not very portable. hoping that it would not explode something or electrocute me if I got sloppy when working on it.





Link Posted: 12/17/2016 7:26:03 AM EST
Solid state w/ 50v devices or surplus Russian metal tubes seems to be the way to go these days.

What sort of application are you building this for? Frequency ranges covered?
Link Posted: 12/17/2016 5:44:33 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By radia:
I built a 3-1000 amp a long, long time ago. Had a lot of fun accumulating the components (tube, socket, chimney, vacuum variable capacitors and whatever-they-call-them-hand-cranks, humungo power supply transformer, edge-wound inductor, gigundo ceramic bandswitch, awesome voltage, current meters, etc.).

Plusses: Big, big signal. Kept the room warm in the wintertime. Enjoyed the cherry red glow from the plate.

Biggest downsides: not very portable. hoping that it would not explode something or electrocute me if I got sloppy when working on it.
View Quote


The 3-1000 is a nice tube to go with.

I love the cherry glow of a large tube when I run CW.

Keep your hands clear of HV when using a HV PS!
Link Posted: 12/17/2016 5:49:40 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By AnalogKid:
Solid state w/ 50v devices or surplus Russian metal tubes seems to be the way to go these days.

What sort of application are you building this for? Frequency ranges covered?
View Quote


HF.
3.5 to 30 MHZ would be the actual end user design.

Link Posted: 12/17/2016 5:51:37 PM EST
I think the 3-500G would be the way to go, if you're OK with 1 kW output power. The power supply is the thing, don't skimp on the capacity of it. 3 kVolts at an amp, and you'll be good to go.
Link Posted: 12/17/2016 6:15:01 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Danner130:
I think the 3-500G would be the way to go, if you're OK with 1 kW output power. The power supply is the thing, don't skimp on the capacity of it. 3 kVolts at an amp, and you'll be good to go.
View Quote


The plate transformer can easily handle 1 Amp CCS all day long. Big boat anchor design. 5 KV with a center tap.

The 3-500 is a very popular tube and many use it. For some odd reason, I was thinking that it ran well on 3 KV.

Many commercial designs seem to run a pair of them in their output stage.

Link Posted: 12/17/2016 11:47:48 PM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Xringlover:


The plate transformer can easily handle 1 Amp CCS all day long. Big boat anchor design. 5 KV with a center tap.

The 3-500 is a very popular tube and many use it. For some odd reason, I was thinking that it ran well on 3 KV.

Many commercial designs seem to run a pair of them in their output stage.
View Quote
With that transformer, you could go to two 3-500's and go legal limit. The tubes would be running well below their max. dissipation. Why not? Plus, home brewed would be super cool. I'd get fancy with the chassis, there's lots of classic knobs and and stuff in the guitar amp home-brew market. Hell make it look like a classic Fender Princeton.
Link Posted: 12/18/2016 12:30:52 AM EST
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Xringlover:


HF.
3.5 to 30 MHZ would be the actual end user design.
View Quote View All Quotes
View All Quotes
Discussion ForumsJump to Quoted PostQuote History
Originally Posted By Xringlover:
Originally Posted By AnalogKid:
Solid state w/ 50v devices or surplus Russian metal tubes seems to be the way to go these days.

What sort of application are you building this for? Frequency ranges covered?


HF.
3.5 to 30 MHZ would be the actual end user design.

@Xringlover
Dunno if you knew this, but ARF has a really great ham radio community here.
Top Top