I am looking for an Amp design I can adapt and build at home with 4X150A tubes.

[Onelasttime]

So I got a GREAT deal on 10 NOS Jan 4x150A tubes. So I would like to build an amp from scratch but I need a design I can copy. I can build almost anything if I have a solid design. I can not on the other hand sit down and design my own amp!

I have repaired many different amps including tube amps but I am at my most comfortable with solid state.

I built my first tube amp in the 1980's in middle school with a Sears Craftsman soldering gun which I still have some place, parts salvaged from TV's at the side of the road and a subscription to Popular Electronics, Science and Mechanics!

So I just need a solid design I can get schematic for and any additional parts list etc.

Is their a commercial amp that was popular that used this tube?

Also any plans for GI7B Russian tube would be great I also fell into 5 or 6 of those!


Thanks for all your help!

 

[linearone]

Build any 3-500z amplifier

 

[Captain Kilowatt]

Build any 3-500z amplifier

Why? He has a bunch of 4X150A's. The 3-500Z is a completely different tube with completely different plate and filament voltage requirements., Something more along the lines of a 4CX250B style amp would be more inline with what he is looking for.

 

[linearone]

Why? He has a bunch of 4X150A's. The 3-500Z is a completely different tube with completely different plate and filament voltage requirements., Something more along the lines of a 4CX250B style amp would be more inline with what he is looking for.

He asked for an amplifier design that he can copy.
I would rather copy a 3-500 z amplifier than build a tiny tet. On another note. I'd rather build a box for a 4-125 or 4-250 in gg. Then you can always swap into a 3-500. The Tubes he has, if built In Gg will do nothing except aggravate.

 

[nomadradio]

The Pride DX300 is the most-relevant commercial design, I'd say. Used just one tube. The 4CX250 is the same tube on the inside as the 4X150. But the "C" in the '250 indicates ceramic. The 4X uses glass to insulate the anode from the screen ring. The difference is the ceramic tolerates a higher temperature. Making the anode ring hotter will cause more Watts of heat per surface area to get dumped into the air stream. Pushing the 150 tube that hard will just fracture the glass.

The one thing going for you is a nearly-complete design description in the revised manual that Bennie from CB Tricks wrote and published 15 or so years ago. Not sure where else you would find that much of the work already done for you.

And if you feel compelled to put more than one tube in parallel, consider how you'll match the tubes so they will share the load equally.

73

 

[linearone]

The Pride DX300 is the most-relevant commercial design, I'd say. Used just one tube. The 4CX250 is the same tube on the inside as the 4CX150. But the "C" in the '250 indicates ceramic. The 4X uses glass to insulate the anode from the screen ring. The difference is the ceramic tolerates a higher temperature. Making the anode ring hotter will cause more Watts of heat per surface area to get dumped into the air stream. Pushing the 150 tube that hard will just fracture the glass.

The one thing going for you is a nearly-complete design description in the revised manual that Bennie from CB Tricks wrote and published 15 or so years ago. Not sure where else you would find that much of the work already done for you.

And if you feel compelled to put more than one tube in parallel, consider how you'll match the tubes so they will share the load equally.

73

By the time he gets a transformer built for the power supply, he'll wish he had built a triode

 

[nomadradio]

This comes up doing repairs. Toasted transformers are not the norm, but stuff happens.

For the HV, use this one: https://www.antekinc.com/as-4t430-400va-430v-transformer/

The two 430-Volt windings in series get used with a full-wave voltage doubler to get 2400 VDC to the anode.

We have used this one for G1/G2 bias/heater/relay supply.
https://www.antekinc.com/as-05t240-50va-240v-transformer/

The full-wave doubler trick on this one actually becomes a half-wave rectifier for the screen grid, and another one with negative output polarity for the control grid.

And they're both seriously affordable compared to most other choices.

73

 

[stack]

So I got a GREAT deal on 10 NOS Jan 4x150A tubes. So I would like to build an amp from scratch but I need a design I can copy. I can build almost anything if I have a solid design. I can not on the other hand sit down and design my own amp!

I have repaired many different amps including tube amps but I am at my most comfortable with solid state.

I built my first tube amp in the 1980's in middle school with a Sears Craftsman soldering gun which I still have some place, parts salvaged from TV's at the side of the road and a subscription to Popular Electronics, Science and Mechanics!

So I just need a solid design I can get schematic for and any additional parts list etc.

Is their a commercial amp that was popular that used this tube?

Also any plans for GI7B Russian tube would be great I also fell into 5 or 6 of those!


Thanks for all your help!

 

[stack]

I use a 2x4x150A it's also homebrew if there is anything I can give you ask, I'm in Joshua tree ca