MikeC Sixty-One SRT

[jeremyb]

Wowsers, sounds glorious!!

[Jay]

I am re-reading this thread and noticed I too have downloaded a copy of this circuit of which you posted a small section on page 2:
There are a number of errors on the complete circuit which you obviously fixed. One being that the valve rectifier winding doesn't show the center tap to ground. Don't know how that can be missed.

Anyway, how much does your current circuit still reflect the original?

SRT OS-71.jpg (39.05 KiB) Viewed 3815 times

[MikeC]

Very close but reverb different and some errors fixed. VRM & sizzle filter added too. Preamp tubes as per Doug & Pat's. Oh, I have a choke in the power supply for the entire amp's power.

[MikeC]

Things have been a little slow of late but #8 has finally found a new home - close to home too! Must be that OCR reduction kicking in already . #9 under construction.

[MikeC]

Sixty-One SRT #9 is all but finished, final cook test to go (it's cooking right now). I need to sell it ASAP (provisional tax) so sharp pricing on this one. Added bonus of 2 x NOS Radiotron 12AU7s instead of usual JJs. 12 months warranty, PM if interested.

[MikeC]

Bump for SRT #9 - $1795.00 to NZG members.

[olegmcnoleg]

Bump for SRT #9 - $1795.00 to NZG members.

That's a phenomenal deal Mike. And a great amp too.

[MikeC]

A quick thanks to Bill Warriner for suggested mods to the Sixty-One SRT. From now on all new builds will be v6 (previously v5.2).
V6 essentially has less gain (there's still plenty), a tamed reverb, tamed tremolo and a huge reduction of the inherent idle hum that was caused by the V2 (mixer) cathode coupling - this latter one really bugged me!

[GrantB]

A quick thanks to Bill Warriner for suggested mods to the Sixty-One SRT. From now on all new builds will be v6 (previously v5.2).
V6 essentially has less gain (there's still plenty), a tamed reverb, tamed tremolo and a huge reduction of the inherent idle hum that was caused by the V2 (mixer) cathode coupling - this latter one really bugged me!

These are worthy changes Mike. At the owners expense, would you be able to make these adjustments on previous versions?

[MikeC]

A quick thanks to Bill Warriner for suggested mods to the Sixty-One SRT. From now on all new builds will be v6 (previously v5.2).
V6 essentially has less gain (there's still plenty), a tamed reverb, tamed tremolo and a huge reduction of the inherent idle hum that was caused by the V2 (mixer) cathode coupling - this latter one really bugged me!

These are worthy changes Mike. At the owners expense, would you be able to make these adjustments on previous versions?

Absolutely!