Vacuum State RTP3C

[zz1969]

Where is the best ground point for elevated heaters voltage deviders? Both high and low?

 

[zz1969]

Got it. CF lower tube.

 

[zz1969]

A question to those who built it with SSHV.

Can you tell me the ground scheme with this reg, please? I 've got a heavy background noise.

 

[fonnesbek]

By noise do you thing it is hum or tube noise ?

 

[zz1969]

Yep, it was hummm.
I managed to get rid of it.Now it is dead quiet. Thank you.

 

[fonnesbek]

What was the problem and hov did you solve it ?

 

[zz1969]

I am trying to use 2 Salas boards from one HV raw supply to feed R&L channels. I just couldn't understand how to connect grounds. So I went the easiest way - just disconnected 1 channel and tested each SSHV with its own channel. But before that I changed all the grid resistors from 100 Ohm to 1K. Hum was gone. Not sure what cured the problem - resistor change or channel isolation. Anyway, now I know that everything works perfect with each channel supply separated and I need to decide which way to go - 2 separate supplies for SSHVs and also heaters or to revert to 1 raw supply and see what comes out.

 

[tbr]

On the production RTPs we (better: I) wire the ground like this: SRs to the chassis star point, ground pin of the umbilical to the star point, ground of the RCAs to the star point. The grounds of the amplifier modules are connected to the feeding SRs then, the ground ends of the 1Ms after the line stage coupling caps to the chassis star point or recently now to the ground of the pre amp out RCA.

The grid stoppers on the PCB version (RTP3E) are 330R now (expectantly more parasitic C and L with the PCB), instead 100R in the hardwired version (RTP3D and earlier).


Thomas Brüntrup
Vacuumstate

 

[zz1969]

Thank you, Thomas.
I believe this will be of help.

 

[RubenV]

@ tbr: Are there still kits for sale? And if so, how much euro's do they cost?

Did anyone compared the RTP3D against commercial designs?

 

[snip3r]

Hi guys, without the phono stage, how much would the parts costs *typically*?

I would like to ask a friend to help build it for me. Any schematic or part list that can be of assistance?

 

[snip3r]

Hi Adrian.

Sorry, I can't help regarding the CD.

Just a point though regarding PCB's, (and I will stand corrected with this if I'm wrong) but I was under the impression that only the very early versions were on PCB. I believe subsequent production, and the preferred option, was point to point wiring.

I've PM'd you.

Hi Valve, Can you PM me as well?

 

[Aleks1]

Start of RTP3 build

I've just started building my own RTP3 having read this thread and buying a copy of Allen's excellent pre-amp cookbook. What an inspiration the man was.

Knocked up the first super reg today. Will try and post regular updates of my build.

 

[Aleks1]

RTP3 Rear Panel

Finally bought myself a battery drill and had a pleasant evening drilling all the holes for the rear panel hardware.

 

[Miko1971]

If anyone has the CD for sale, I'd be interested in purchasing it. Building a RTP is something I'd like to do... Allen was a genius and you'd be hard pressed to equal or surpass the performance of this pre..

Please pm

Thanks...

 

[6L6]

Is it no longer available from their website?

Vacuum State - High End Hifi Equipment

 

[Miko1971]

I don't think so, i ordered a super Regulator kit for my own custom pre amp and it was kind of a pain to just get that.

 

[Kim Bay Smidt]

I recall that they no longer offer the instructions on a CD.

 

[Zen Mod]

Esteban , that's not nice

please - remove public link

share with friends , if you like , but putting it in public .......

 

[Moderation Team]

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