The Amp Garage

Ok..

It's seem's to be ok, tha amp can be adjust if thing's became critic

You say not recommand, cause too much current ?

Ok, I will check as soon as I receive the tranfo's

Yep ok,

So for BIAS adjustement a 47K and a 50K pot will be fine

The 60v on the BIAS tap is on my mind..

circuit was for a 50V wire, I must have to adjust the 15K arfter the diode a litthe hier ?

Thanks

Ok guy's I Got , finally , the specs From Mercury Magnetic

B+ 250 ma

Bias is 60V at 100 ma

6.3 8-10 amps ( I know this is not ecaxt...)

5V 4 amps

I email Mercury magnetic for more detail on the PT.

Yes, i should take a basse schematic of a bass amp, the thing is I didn't find a Layout.

Ian, the screen resistors seem's ok at 1K 5W... you mention 2K ?, never see that before... Why ?

And Yes, 4 x 6550 gonna be use

I'm sorry about post multi thread... but the tread was for different question... sorry for the confusing,

I didn't find a better place to find very knowledgeable people and tips/help...

Best regards

Dave

didit, sorry my english....

I Must go with those mods !

Thanks you all helping me throw this project !

This mean a lot to me !

The output is A FTHPT-OMA From Mercury Magnetic
2K primary 4/8/16 ohm Tap

Hi Colossal,

I'm going to use 6550 Power Tube, I think this transformer is going to be fine...or is over powered ?

Sluckey,
The PT it a Mercury Magnetic
I got the 50V tap on it.

Thanks for the infos !

Really appreciate !

Hi PDF, thanks for the infos, I already mod , on paper, the rest of the amp, Reduce 4 input to 1 V1 50uf/50v with a 1K cathode 6550 Power tube, Powercap, 20uf/20uf to 47uf/47uf , second one 20uf to 47uf and pre-amp one 20uf to 22 uf. coupling cap between v1 and volume 0.022 to 0.05 PI entry 0.022 to...

Hey !

I plan mod the 5F8-A tu use 6550

The fix bias resistor 56k going to be replace by a trim pot 25K

But, to use the 6550 tube, i plan to use a 47K in line with the pot...

Question, ; to get the 70% ( or more ), is the 47 are ok ??? Higher or lower ?

Thanks

Thanks ! I will go for a 5F8-A, with some modifications. Reduce 4 input to 1 V1 50uf/50v with a 1K cathode 6550 Power tube, Powercap, 20uf/20uf to 47uf/47uf , second one 20uf to 47uf and pre-amp one 20uf to 22 uf. coupling cap between v1 and volume 0.022 to 0.05 PI entry 0.022 to a 0.05 Solid State ...