Brett's 12B4 schematic?

[phrarod]

Anyone have a link to this? I searched the forum and there's post but nothing with an actual schematic

 

[colinB]

Hi,

See attachment for schematic of Brett's 12b4 linestage - hope this is the right one.

An externally hosted image should be here but it was not working when we last tested it.

Cheers
Colin.

 

[Brett]

That's the one Dave did the drawing for, but there were many variations, including transformer and CCS loading, parafeed with Tx output etc.

Also try the R loaded version with a string of cheap low output red LEDs in series like SY's Red Light District amp in the cathode with no bypass cap.

 

[phrarod]

Thanks! Love to see the one with the Trans ouput.

Brett, did you ever have a favorite sonically?

 

[Brett]

Thanks! Love to see the one with the Trans ouput.

Brett, did you ever have a favorite sonically?

SE: Pimm CCS loaded plate, parafeed with a Lundahl OPT, forget which but probably a 1660 as I was using them around this time. One of the IXYS units would do fine as CCS too I reckon.

PP: CCS in cathodes with Lundahl OPT. This was my preferred version, but I don't like most SE amps.

I'd start with the resistively loaded one with 5 red LEDs in series in the cathode.

Sorry I don't have any pics as I don't use a preamp in system any more so they were disassembled and returned to the parts box.

 

[phrarod]

Thanks Brett! And Colin.