The schematic of message 57 is identical to the last page of the TPCB, Second Edition...that's the one I am using.
Super Reg Kit...
I've recently tried to purchase one of these unsuccessfully directly from Vacuum State as well as from USA distributors, and even emailed Joe R for help. No one responded to my queries and the VS website is insecure with warnings.
The SReg is supposed to be good for up to 100mA, so based on two channels of SVP1 being less than 100mA, I figure I'll try the lone SReg kit that I have for both channels, for starters. A couple of questions:
1. I understand that there are improvements in more recent SReg kits than mine, both in the current source with update from the 317, and with the opamp in the vreg half of the circuit being recommended to be changed, to AD797. Could anyone provide details for either or both of these changes? I would surely help me along in my build, and perhaps give the opportunity for a separate reg for each channel.
2. What are you using for the 30v reg'd supply in the vreg circuit? I'm thinking Salas SSLV1.3 UltraBiB shunt regulator , the only one I've come across that seems appropriate.
Thanks for any help, and Best Regards,
Robert
I've recently tried to purchase one of these unsuccessfully directly from Vacuum State as well as from USA distributors, and even emailed Joe R for help. No one responded to my queries and the VS website is insecure with warnings.
The SReg is supposed to be good for up to 100mA, so based on two channels of SVP1 being less than 100mA, I figure I'll try the lone SReg kit that I have for both channels, for starters. A couple of questions:
1. I understand that there are improvements in more recent SReg kits than mine, both in the current source with update from the 317, and with the opamp in the vreg half of the circuit being recommended to be changed, to AD797. Could anyone provide details for either or both of these changes? I would surely help me along in my build, and perhaps give the opportunity for a separate reg for each channel.
2. What are you using for the 30v reg'd supply in the vreg circuit? I'm thinking Salas SSLV1.3 UltraBiB shunt regulator , the only one I've come across that seems appropriate.
Thanks for any help, and Best Regards,
Robert
That is highly unlikely. If that would be so, I screwed up royally and I would appreciate if you point out where.
Jan
Jan
Jan,
It's in the Tweaks section at the end. If the Mods feel the pic is against the rules, feel free to remove it.
Alex
Attachments
Well, anyone can write what they want but this is totally wrong. If you read what Walt Jung and myself have written over many years, a recurring theme is NOT to use the AD797 as it is very hard to keep stable in this circuit.
So whatever idiot wrote this, he clearly has no clue and just makes things up.
The tweaks section is particularly nonsensical. Read at your peril.
Also, he seems to miss the point that the high performance of the original SR is partly due to the absolute avoidance of star grounding.
Where did you find this diatribe?
Jan
So whatever idiot wrote this, he clearly has no clue and just makes things up.
The tweaks section is particularly nonsensical. Read at your peril.
Also, he seems to miss the point that the high performance of the original SR is partly due to the absolute avoidance of star grounding.
Where did you find this diatribe?
Jan
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OK, two comments:
I'll leave it at that.
Jan
- This superreg has nothing to do with the superreg developed by Walt Jung and myself and available as a PCB in the diyaudio store;
- Only speak good about the deceased.
I'll leave it at that.
Jan
I was just reading: https://www.diyaudio.com/community/threads/vacuum-state-rtp3c.151733/page-2
The following snippet is from a post by Allen Wright himself regarding changing from LF351 to AD797 and eliminating the LM317:
"4/ There are two upgrades for the SReg, one is to use a AD797 opamp (with a 0.1 or 1uF ceramic SMD cap across the powersupply pins), the second is to toss the LM317 in the CCS section, because it honestly sound FAR better and stable without it. Most kits shipped in the past 5 years have had that page included in the instructions."
Best, Robert
The following snippet is from a post by Allen Wright himself regarding changing from LF351 to AD797 and eliminating the LM317:
"4/ There are two upgrades for the SReg, one is to use a AD797 opamp (with a 0.1 or 1uF ceramic SMD cap across the powersupply pins), the second is to toss the LM317 in the CCS section, because it honestly sound FAR better and stable without it. Most kits shipped in the past 5 years have had that page included in the instructions."
Best, Robert
Hi Jan,
In the context of the subject of this thread, your superreg is irrelevant...we are looking for 250V out, not 20V. Yours cannot even do the 30V called for in TTPCB to power the shunt reg op amp. And furthermore it's out of stock at the diyaudio store.
Cheero, Robert
In the context of the subject of this thread, your superreg is irrelevant...we are looking for 250V out, not 20V. Yours cannot even do the 30V called for in TTPCB to power the shunt reg op amp. And furthermore it's out of stock at the diyaudio store.
Cheero, Robert
Yes, that's correct. Jason is getting boards to stock up.
But I have another one just for this thread: T-reg, for anything up to 500V and 400mA, fully protected, with superreg performance. I mean original superreg performance ;-).
Check it out: https://diyaudiostore.com/collections/power-supply-kits/products/linear-audio-t-reg.
Jan
But I have another one just for this thread: T-reg, for anything up to 500V and 400mA, fully protected, with superreg performance. I mean original superreg performance ;-).
Check it out: https://diyaudiostore.com/collections/power-supply-kits/products/linear-audio-t-reg.
Jan
Hey Jan, Yes, but yours is a series reg and what we are looking for here is a shunt reg.
Best, RC
Best, RC
It is part of the VSE "package". All the preamps (and power amps, too) come with his SuperReg , which is a shunt regulator. Allen was of the very firm belief that shunt regs sounded better.
Alex
I realise where the confusion arose. Allen Wright called his shunt regulator design, which has been published in his TPCB for over 20 years, the "SuperReg". And Jan Didden and Walt Jung have independently published a completely different regulator design with the same name. Since this thread is about Allen's preamps, Robert and I are both referring to his regulator circuit and to his recommendations for aftermarket changes to this specific circuit (namely, the removal of the LM317 in the constant current circuit, and the replacement of the op-amp).
So of course our comments, as well as anything Allen wrote about it, are completely irrelevant to Jan and Walt's design. No suggestion is intended or implied in this discussion of the superiority of either regulator design, apart from the fact that (as I stated earlier) all Allen's preamps were designed and packaged with his regulators.
Alex
So of course our comments, as well as anything Allen wrote about it, are completely irrelevant to Jan and Walt's design. No suggestion is intended or implied in this discussion of the superiority of either regulator design, apart from the fact that (as I stated earlier) all Allen's preamps were designed and packaged with his regulators.
Alex
SuperReg Updates ? ? ?
So, if you remove the 317 from Allen's SupertReg, what are you left with? Is there still a current source there? Or are you back to the "R" of page 7 of the Super Reg section of the TPCB? Which if I recall was what Allen wanted to improve upon.
I'm still trying to purchase a second SuperReg kit from VSE with no luck so far. I have one that I purchased (Invoice date 09-07-2012) but I have not yet found the instructions that came with it, so I don't know what to do with the current source part of the circuit without the 317. Any help with tht would be Heaven sent. And, furthermore, I have a bag of parts to populate the board, but no BOM, so I don't really know what the part numbers on the PCB should be. Help, please. And yes, I have a couple of places where I can look for the original instructions and I will look there.
Thanks for any help, Best, Robert
So, if you remove the 317 from Allen's SupertReg, what are you left with? Is there still a current source there? Or are you back to the "R" of page 7 of the Super Reg section of the TPCB? Which if I recall was what Allen wanted to improve upon.
I'm still trying to purchase a second SuperReg kit from VSE with no luck so far. I have one that I purchased (Invoice date 09-07-2012) but I have not yet found the instructions that came with it, so I don't know what to do with the current source part of the circuit without the 317. Any help with tht would be Heaven sent. And, furthermore, I have a bag of parts to populate the board, but no BOM, so I don't really know what the part numbers on the PCB should be. Help, please. And yes, I have a couple of places where I can look for the original instructions and I will look there.
Thanks for any help, Best, Robert
Many thanks Alex,
I've been reading, re-re-re reading the TPCB and realized that I do not need one of the claimed benefits of the SVP, that of being able to drive 16 metres of high capacitance cable. The preamp-out to power amp-in distance in my systeme is about 12 inches, and input Z is 100K.
So, that takes me back to the FVP4, with the 5687 SRPP output stage as a possible place to start with my build.
This would save/eliminate at least one valve per channel.
It is tempting, since Allen himself at one point raved about it.
Thoughts?
Best, Robert