#002 Steel String Singer - almost there

[martin manning]

Fantastic! I think we've all been there before... ;^)

[Roe]

we need a new clip!

[Lothy]

Fantastic! I think we've all been there before... ;^)

Hey Martin,

after some further testing, I really dig the step filter with your configuration. I mean, I have no comparison to the original one, but this is excellent for shaping the tone to different cabs/guitars etc.
The amp works really great now with my Three Musketeers - Keeley Comp+, TC Spark Booster, Nobels ODR1.

Last thing to do, FET-Boost, just to make it complete.

Cheers
Gerhard

[Lothy]

we need a new clip!

Just very quick, this time with humbuckers
https://photos.app.goo.gl/ZnWGDBBf58YuEi4y9

[martin manning]

after some further testing, I really dig the step filter with your configuration. I mean, I have no comparison to the original one, but this is excellent for shaping the tone to different cabs/guitars etc.

Good to hear, Thanks! TAG now has a good guide for the mods to R Colgan's layout, and Erwin V's PCB.
Great sounds and playing there!

Last thing to do, FET-Boost, just to make it complete.

What have you got planned there? What FET, Vdd, and bias?

[Lothy]

What have you got planned there? What FET, Vdd, and bias?

I'm not sure yet. The suggested transistors for the original FET are hard to get and expensive. There is a project in a German DIY tube amp forum called LND Boost, which is very promising.
https://www.tube-town.net/ttstore/en/ln ... ojekt.html

LND-boost_PCB-v0.9-1st Test.jpg

Cheers
Gerhard

[martin manning]

Can you get 2N4416A? Mouser carries that one, should be fine for traditional D FET boost.

[Lothy]

Can you get 2N4416A? Mouser carries that one, should be fine for traditional D FET boost.

Yes but 20 bucks for the delivery. No way...

[martin manning]

Any e-Bay sellers have them or 2N3823? You might get a few for a reasonable price.

[erwin_ve]

Can you get 2N4416A? Mouser carries that one, should be fine for traditional D FET boost.

Yes but 20 bucks for the delivery. No way...

Ill PM you on this.

[Lothy]

What have you got planned there? What FET, Vdd, and bias?

I have a 12V tap left on the transformer, so I'm not bound the FET or the LND boost.

[Raja_Kentut]

look at reichelt.de… they offer some in TO-92 package, real cheap enough to try some of them if they suit your taste…
Search for „jfet“ on their site, than narrow down to „N“ type

[martin manning]

I have a 12V tap left on the transformer, so I'm not bound the FET or the LND boost.

Not quite sure what you mean there, but if you have a 12VAC source then you will need a rectifier and filtering to make that usable for a transistor boost. The Dumble JFET or the LND boost could be powered from B+5.

[Lothy]

I have a 12V tap left on the transformer, so I'm not bound the FET or the LND boost.

Not quite sure what you mean there, but if you have a 12VAC source then you will need a rectifier and filtering to make that usable for a transistor boost. The Dumble JFET or the LND boost could be powered from B+5.

I think it is given, that you need a rectifier and filtering and some kind of voltage regulator. On the long run, I want the boost to be footswitchable anyway. The FET boost by it's own is not usable for me if I have to stick the cable from one input to the other. But I'll give the FET a try.
Cheers
Gerhard

[Lothy]

look at reichelt.de… they offer some in TO-92 package, real cheap enough to try some of them if they suit your taste…
Search for „jfet“ on their site, than narrow down to „N“ type

No 2N4416A there...I can order some other types, stick them in and look what happens...