Gutting Ashdown guitar amp and rebuild as point to point bass amp

[Erik Aa]

Hi all.
I recently got an Ashdown fallen angel fa60 dsp amp dirt cheap. It is a 50 watt head with 2 el34 and 12ax7s in the preamp section.

I am thinking about gutting it and rebuild it, take some of the usable parts and build a point to point 50 watt bass amp head.

One candidate is the jmp 1986. But I am open to any and all suggestions. The 1986 has a choke, and there is no choke in the ashdown.

What do you think and suggest? Thanks!

Erik

[Latole]

Bought a choke.

Schematic here;

Ashdown:

https://el34world.com/charts/Schematics/files/Ashdown/Ashdown_fallen_angel_60_schem.pdf

Marshall Bass 1986;

https://el34world.com/charts/Schematics/files/Marshall/Marshall_jmp_bass_50w_1986.pdf

or ;

[Latole]

Clone ;

https://www.thegearpage.net/board/index.php?media/f8e2faf4-3ff4-4ffd-a557-97993810b0c8-jpeg.243158/

[kagliostro]

https://www.thallenbeck.com/blog/posts/d-i-y-ampeg-b15n-fliptop-clone/

Ciao

Franco

[Erik Aa]

Thanks for inspiring suggestions. Any suggestions for an amp/schematic without a choke?

[sluckey]

Thanks for inspiring suggestions. Any suggestions for an amp/schematic without a choke?

Ampeg, Supro, Traynor, Trainwreck all have amps with no choke. Plenty more too. Just browse through the schematics in the Tube Amps Schematic Library. Link at the bottom of this page.

[kagliostro]

Any suggestions for an amp/schematic without a choke?

http://ctgelectronics.weebly.com/custom-amplifier---fcn-51-b.html


--


If you want you can build your own "choke"



https://www.loetstelle.net/projekte/gyrator/gyrator.html



Franco

[PRR]

Schematic here;
Ashdown:
https://el34world.com/charts/Schematics/files/Ashdown/Ashdown_fallen_angel_60_schem.pdf

Hmmm... that "Fallen Angel 60W" PDF's second page is for a "20/40 HM Guitar Amp". Meaning it may not be right for a 60W?

I don't think there is any reason not to use the stock (or repaired) FA 60W power supply, with the 470r in place of a choke. But if you really need to carry (and buy/ship) another pound of iron, put a choke in.

[Latole]

Traynor YBA-4 . YBA-1 Bass Master

https://el34world.com/charts/Schematics/files/Traynor/Traynor_yba_4.pdf

[Latole]

Choke are cheap ; $25
https://www.tubesandmore.com/products/transformers_chokes?filters=969a846c65a969

Heyboer ; $34 ;https://shop.amppartsdirect.com/products/marshall-vintage-plexi-style-3-hy-choke-apd-8058h-by-heyboer

[Erik Aa]

Thanks a lot. I have been thinking about going the Traynor route. Some of them run crazy high plate voltage though. Do they eat tubes or is this issue exaggerated?

[Latole]

Some Traynor schematic I saw with EL34 / 6CA7 use 433 volts DC

[Latole]

If I want a "Marshall" tone I won't built à Traynor, I'll spend $25 + shipping for a choke