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#26 pre amp
#26 pre amp
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Old 11th February 2012, 03:49 PM   #1601
Salas is offline Salas  Greece
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#26 pre amp
Main difference of just VR tubes and a reg after the noise (plate side) is under a threshold -and this is a low gain line level stage after all, easy to tackle that noise aspect, not a phono- is the dynamic impedance. VR is just a stabilizer, the particular regulator has an error amplifier of 1000 times gain. A much better source, impedance-wise. You will have to evaluate after experiencing both alone, or in combination. I also find excess regulation gain stiffening tone up, but no gain too loose also. Tried for not spoiling the tone, just adding benefits. In the beta testing feedback round the first ''victim'' was a #26, second one was a C3G phones device, both transformer output. Independent feedback was heartening. Specs and subjective evaluations had been taken into account in a hopefully good mix and balance. Not easy to improve ''likes'' on the widely used SSHV1, it took some modesty, team testing, time and care. Wishing success with your experiments.
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Old 11th February 2012, 03:56 PM   #1602
Burnedfingers is offline Burnedfingers  United States
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In easier to understand english what did you just say?
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Old 11th February 2012, 04:01 PM   #1603
Salas is offline Salas  Greece
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#26 pre amp
VR VS regulator may not be choosing on noise grounds but on other sonic aspects for you.
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Old 11th February 2012, 04:27 PM   #1604
Steven-H is offline Steven-H  United States
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Im still following this with great interest; and cannot wait to hear how things work out for Magz and Burnedfingers.
Right now Im faithfully replicating Kevin's PSU schema...And we'll see how I like it. If I decide to do something different, I'll still have a 300v tranny and a GZ37 to start with. Considering the high voltage, VR tubes and the Salas board will be the next logical option to get my B+ down.
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Old 11th February 2012, 04:41 PM   #1605
vgeorge is offline vgeorge  Greece
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#26 pre amp
If you go with choke input you will be around 240V. Then SSHV2 with heavy heat sinking will be enough.
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Old 11th February 2012, 04:55 PM   #1606
massimo is online now massimo  Italy
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Quote:
Originally Posted by Salas View Post
...second one was a C3G phones device ... transformer output.
Any chance to see a schem one day or another?
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Old 11th February 2012, 04:56 PM   #1607
Salas is offline Salas  Greece
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#26 pre amp
Ask Stixx in the SSHV thread.
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Old 11th February 2012, 05:03 PM   #1608
Steven-H is offline Steven-H  United States
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If you go with choke input you will be around 240V. Then SSHV2 with heavy heat sinking will be enough.
Thanks. I'll have to study the documentation to see how much Vdrop it can do.
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Old 11th February 2012, 05:07 PM   #1609
Salas is offline Salas  Greece
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#26 pre amp
Pq1=(Vin-Vo)*CCS. Max practical Q1 board level sink is around 3.8C/W.
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Old 11th February 2012, 05:19 PM   #1610
vgeorge is offline vgeorge  Greece
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#26 pre amp
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Originally Posted by Steven-H View Post
Thanks. I'll have to study the documentation to see how much Vdrop it can do.
If you do a LCRC filter you can get a few more volts drop and a little bit better pre filtering. A 1k 5W resistor will drop 40 volts at 40mA.
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