Ampeg B-15N - Documentation Link

[kagliostro]

For those who can have interest on the B-15N Ampeg a link that I've find and that contains a lot of good info

https://www.talkbass.com/wiki/technical-amplifier/

Franco

[shooter]

nice find!  I see you don't sleep well either

[kagliostro]

Ciao

May be it was not so early in the morning, here we are near Greenwich meridian   


add 7 hours to the time you see on the forum 

Franco

[DummyLoad]

For those who can have interest on the B-15N Ampeg a link that I've find and that contains a lot of good info

https://www.talkbass.com/wiki/technical-amplifier/

Franco

cool! thanks for sharing that K!

building another all octal-socket amp is in the forecast. i'd probably go with SS recto.


--pete

[ManisMan]

Question on fixed bias in that documentation. How does the biasing circuit work to provide a negative voltage to the grids?

Is it because you have both + and neg coming out of the secondary taps?

[pompeiisneaks]

Unless I'm looking at the wrong schematic, it's not fixed bias, it's cathode biased no?

~Phil

[ManisMan]

https://www.talkbass.com/wiki/technical-amplifier/#24-converting-a-b-15n-from-cathode-bias-to-fixed-bias

[sluckey]

The early ones were cathode biased. Later ones were fixed bias. Keep scrolling down the page and you will see.

It's just a very simple half wave rectifier. Nothing special. Hundreds of amps use that same circuit.

[pompeiisneaks]

Oh thanks mantisman and sluckey, that makes more sense :)  Yup that's a bias circuit I've seen over and over in my limited experience too.

~Phil