UK Vintage Radio Repair and Restoration Discussion Forum

UK Vintage Radio Repair and Restoration Discussion Forum (https://www.vintage-radio.net/forum/index.php)

- Vintage Audio (record players, hi-fi etc) (https://www.vintage-radio.net/forum/forumdisplay.php?f=14)

- - Mullard 3-3 voltages query (https://www.vintage-radio.net/forum/showthread.php?t=178701)

Re: Mullard 3-3 voltages query

I think you mean the Quad II but yep it's very clever. I'm amazed that no one else did this... that I know of anyway!

Re: Mullard 3-3 voltages query

Yes I did mean the Quad 2 quite correct sir
Trev

Re: Mullard 3-3 voltages query

Quote:

Originally Posted by Edward Huggins (Post 1365059)

Quote:

Originally Posted by Herald1360 (Post 1364984)

Quote:

Originally Posted by murphyv310 (Post 1363362)

Why not try an EF37A & EL34 3-3?

Wouldn't that be a 3-6?

8-)

A variant of this was used on the (very rare) Pye Super Black Box with a SE EF86/EL34. Some cribbing of the Mullard 3-3 circuit was used by the Pye Labs.

Hello,

Ah that reminds me of the Super Black Box project of last year where I took two SBB chassis and made a stereo amplifier – as I said in the post no usable or restorable SBB’s were harmed in this exercise!

As said about the Mozart it has quite a modern sound and happily dives my KEF three way speakers.

Link to the thread.
https://www.vintage-radio.net/forum/...=175144&page=2

Ps. I actually have a SBB to restore, which I got end of last year – at present it’s in the kitchen utility area and SWMBO is getting vocal as to when it’ll find its way out the utility area and into the workshop >:(

Terry

Re: Mullard 3-3 voltages query

Quote:

Originally Posted by Jez1234 (Post 1365538)

I think you mean the Quad II but yep it's very clever. I'm amazed that no one else did this... that I know of anyway!

McIntosh?
I think they use/used Cathode feedback in their valve amps.
Could be wrong of course.

Andy

Re: Mullard 3-3 voltages query

I think Mcintosh used a higher level of cathode feedback but remember this is a two edged sword if you use cathode feedback you have to increase the drive voltage
You win some you lose some
Having said that I have made some nice little amplifiers in my time
Trev

Re: Mullard 3-3 voltages query

I meant in single ended amps... but yep in push pull there's McIntosh, EAR, Papworth and some TVA (the EAR, Papworth and TVA all designed by the late great Tim de Paravicini and variations on a theme) and no doubt more...

Re: Mullard 3-3 voltages query

Quote:

Originally Posted by Jez1234 (Post 1365779)

...the late great Tim de Paravicini ...

Oh no! I had not heard of his death. May he RIP.