6C33C SE-OTL Project

[IslandPink]

Result !

[pre65]

Oke I have found A pair of Kemet /Rifa 6800uf 160vdc at a local dump shop for 8 euro a piece
Hopefully they sound as good as they look
If all goes wrong the speakers should be safe !

I may have a few of those in my spares box.

[brommermartin]

Result !

Work in progress

[brommermartin]

Today i did A test run for two ours on A 16-Ohm dummy load , no smoke or sparks
Did some tests with A squaire wave generator and set te feedback resistor at 3k for the moment.

[Ray P]

That's very dilligent - I'm not sure many of us would have been able to resist hooking up a test speaker by now.

[brommermartin]

Have listened for one hour and this amp has great potential
All the capacitors are new so no tweaking till is set properly .
With brass instruments it tend to sound a bit grainy, but hopefully it disappears.
I have 6,8uf Obligato oil caps for bypass the output caps evt

[brommermartin]

[IslandPink]

Very nice. Are those AER's in the horns ?

[Wolfgang]

It's a little early for these kind of recommendations as you have just started putting the basic parts together but the "grainyness" disappears - among other wonderful developments - if you use a Maida regulator for the 6SN7.

[brommermartin]

Very nice. Are those AER's in the horns ?

Yes AER MD1

[brommermartin]

It's a little early for these kind of recommendations as you have just started putting the basic parts together but the "grainyness" disappears - among other wonderful developments - if you use a Maida regulator for the 6SN7.

I have the salas shunt regulator ( sshv2 ) in my parts bin

[Ray P]

I have the salas shunt regulator ( sshv2 ) in my parts bin

Give it a try - will be interesting to get you're view on the result.

I'm resurrecting my own 6C33C project and will use a maida reg on the 6SN7 stage.

[Ray P]

Wolfgang, have you considered using current sources for the plate loads of the 6SN7 sections?

Ray

[Wolfgang]

Wolfgang, have you considered using current sources for the plate loads of the 6SN7 sections?

I didn't think about this, Ray. What do you have in mind as HV CCS?

[Ray P]

Wolfgang, have you considered using current sources for the plate loads of the 6SN7 sections?

I didn't think about this, Ray. What do you have in mind as HV CCS?

It was talk about choke loading and the like and I'm aware that K&K Audio have a selection of low-price current source kits and was thinking it might be interesting to try them out. They feature a little down this page;

http://www.kandkaudio.com/other-kits/

I already have the option to use the K&K Audio current sink on the cathode of the output valve.