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Old 2nd August 2010, 12:14 PM   #4281
Salas is online now Salas  Greece
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Quote:
Originally Posted by merlin el mago View Post
What about this:

P.S. Sorry for off topic.
Too much gain for a wise system gain structure I would suppose. But if you have a SSHV reg which is adjustable, a few favorite valves, and some leftover passive components you can experiment with potential circuits till the cows come home. A line valve stage is simple, low components count usually, and fun to play. Big glowing, all parts hefty to hold and put together.

P.S. 165V 40mA setting on the reg should suffice for that cct you posted.
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Old 2nd August 2010, 12:29 PM   #4282
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I have on hand:

50K Noble can I use after circuit for volume pot, or need 100K or more?

1 Tx 240V & 8.5V from old Audionte DAC 2 can I use it?

As tubes I have on hand 2 tubes matched pairs of:
E88CC Siemens OB NOS gold pin (the best for everybody)
6922 Sovtek matched for Rod Elliot (Altavista Audio) are the best current manufacturer ultra low noise
E88CC / 6922 NOS Russian ultra low noise (mine favorites)

Sorry for off topic.

Last edited by merlin el mago; 2nd August 2010 at 12:40 PM.
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Old 2nd August 2010, 12:30 PM   #4283
Salas is online now Salas  Greece
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Originally Posted by RCruz View Post
Power comes from outboard psu into a 5 pin XLR.

Inside riaa case, power goes from XLR to the shunt using 2 core shielded cable. Shield is used to connect shunt to star gnd at XLR. Two inner wires carry (+) and (-).

From shunt to riaa board I use two cables:
Sense (+) and (-) are connected using single thin coax.

Force (+) and (-) connected using the same mic cable as before.

Remenber that I had no problem with my previous v1 shunt.
Beautiful I must say. There are wide distances from + to 0 due to big parts, there can also be a gremlin in the CCS cascode or CFP arrangement, but those things can't be reliably guessed at. The best method is we standardize a layout for the regs on dummy load with the help of an oscope, then we put them in, check again with real load, we know power is clean, then we change things about helping loop area to be tighter if the whole build presents hum sensitivities. This is 56dB gain, it will not give us slack. But you wrote its very nice for hum now with the Klotz shielded power runs. That hints towards loop area pick up. It would not change oscillation. V1 had 5mm pin distance electrolytics was much more together for +/0 in its output and bypass too.
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Old 2nd August 2010, 12:45 PM   #4284
Salas is online now Salas  Greece
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Quote:
Originally Posted by merlin el mago View Post
Volume pot value? 50K or 100K after circuit or before circuit? current for heater 6.3V?
Isn't there any comment or psu arrangement where you found that CCT? Anyway, I would use a 50K log on input. Those novals need 365mA @ 6.3V each. The top one's heater must float on some B+ potential divider since there is 50V max cathode to heater spec in those.
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Old 2nd August 2010, 12:57 PM   #4285
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Quote:
Originally Posted by Salas View Post
Isn't there any comment or psu arrangement where you found that CCT? Anyway, I would use a 50K log on input. Those novals need 365mA @ 6.3V each. The top one's heater must float on some B+ potential divider since there is 50V max cathode to heater spec in those.
I din't see nothing, link:

6DJ8 / ECC88 / Symmetrical SRPP Tube Preamplifier Schematic

If you will prefer can continue by pm?
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Old 2nd August 2010, 12:59 PM   #4286
Salas is online now Salas  Greece
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Better, its too much OT.
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Old 2nd August 2010, 01:04 PM   #4287
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Ok will continue by pm, thanks & sorry to everybody for a lot OT.
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Old 2nd August 2010, 01:24 PM   #4288
RCruz is offline RCruz  Switzerland
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Well, I already built six v12 with EL output cap with exactly the same layout and those work perfectly without any hum. But the fullfim is much better in terms of dynamics, detail and speed.

With the klotz cable, hum is only aparent when at full power without signal but I need to get rid of it (or at least determine its precise origin) Maybe the big output cap is acting like an antena.

What is CFP arrangement ?

I decided to invest in an oscope.... Is this suitable ? VELLEMAN SA - HPS10 - OSCILLOSCOPE, HANDHELD, 10MHZ VELLEMAN SA|HPS10|OSCILLOSCOPE, HANDHELD, 10MHZ | Farnell Portugal

I chose it for the lowest cost because I am now quite short in tim€

Last edited by RCruz; 2nd August 2010 at 01:26 PM.
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Old 2nd August 2010, 01:48 PM   #4289
AndrewT is offline AndrewT  Scotland
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post4279.
Are the blue and brown from the sheathed cable to the circuit, the power supply lines?
There is an enormous gap between blue and brown.
Is there a third wire terminating next to the terminal socket?
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regards Andrew T.
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Old 2nd August 2010, 02:02 PM   #4290
RCruz is offline RCruz  Switzerland
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In the riaa board, blue is GND and brown (red in real life.. camera to blame) is (+).

Maybe I should try to interlace those lines to minimize the loop area....

The top terminal block is (-) and the lower one is (+)

What you see is a solder point needed to connect sense wire to the upper terminal block (-).
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