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Old 24th March 2011, 06:10 PM   #141
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally Posted by Wavebourn View Post
By the way, here is a rear panel: speaker outpurs, 4 switchable inputs in the left corner, and in the right corner inputs for MC and MM, with a switch between them. I decided to use a 5-pin female XLR for MC input. MC input will be balanced.

Do you know if some standard for XLR inputs for MC phono exist?

Click the image to open in full size.
Pin Function
1 Chassis ground (cable shield)
2 Positive polarity terminal (hot)
3 Return terminal[4] (cold)
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File Type: png 300px-XLR_pinouts.png (23.8 KB, 1254 views)
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Old 24th March 2011, 07:06 PM   #142
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Quote:
Originally Posted by Helmuth View Post
Pin Function
1 Chassis ground (cable shield)
2 Positive polarity terminal (hot)
3 Return terminal[4] (cold)
Thank you Helmuth;

I mean 5 pin XLR for balanced stereo ins from MC head.

Nooks like no standard exist, so I will invent mine.
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Old 24th March 2011, 10:47 PM   #143
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Quote:
Originally Posted by Wavebourn View Post

Do you know if some standard for XLR inputs for MC phono exist?
These are the common ways they are hooked up


3 pin 1 gnd 2 hot 3 return

4 pin 1 gnd 2 return 3 in between 4 hot

5 pin 1 gnd 2 return L 3 hot L 4 return R 5 hot R
or 5 pin 1 gnd 2 hot in 3 return in 4 return out 5 hot out (prevents feedback)

6 pin 1 gnd 2 return A 3 hot A 4 return B 5 hot B 6 unbal in

ES
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Old 25th March 2011, 12:30 AM   #144
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Quote:
Originally Posted by simon7000 View Post

5 pin 1 gnd 2 return L 3 hot L 4 return R 5 hot R
Thank you Simon!
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Old 9th May 2011, 06:47 PM   #145
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A month ago local audiophiles were impressed by sound of this amp.
We used this speakers to try it:

Click the image to open in full size.

The sound was very natural, clean and detailed. However, such speakers require at least 10W of power to be happy, but for more effective speakers it is the killer amp.

Edit: despite of common beliefs, audiophiles absolutely did not react on presence of semiconductors and absence of an interstage transformers. They did not ask about resistors and capacitors. They asked about tubes and transformers, though, demonstrating understanding of linearity, smoothness, distortions (non-linear and frequency & phase response). All attention they paid on sound quality.
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Last edited by Wavebourn; 9th May 2011 at 07:16 PM.
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Old 10th May 2011, 07:15 PM   #146
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Last schematic, attached
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File Type: jpg gubernator-7-1-sch.jpg (152.6 KB, 2866 views)
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Old 27th May 2011, 08:25 PM   #147
mogliaa is offline mogliaa  United Kingdom
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Hi Anatoly,
Congratulations for this superb design. I'm sure you're enjoying it!
I've traced the 4P1L triode strapped anode curves (see attached).
What is the bias point in your design?

Cheers,
Ale
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Old 4th June 2011, 10:13 PM   #148
ratbagp is offline ratbagp  United States
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I need a little help with a 4P1L line stage I am building. From the various plate curves I've seen I'm aiming at roughly 150 volts plate, 15 ma and -15 volts bias. The plate load is a a couple of cascoded DN2540's per channel similar to
Tube DIY Asylum - RE: Hooked up the Ixys IC CCS tonight - preliminary results - Tre' - July 11, 2009 at 22:13:45

The output of the ccs is connected to pins, 2, 3, 4.

The mu output of the ccs connects to a 2uf cap and thence to the output rcs socket.

I'm using a regulated 3.9 volt DC supply to power the heaters (pins 1 & 7). The supply is floating (simple LM317 to start with). I've got a 47uf cap across pins 1 & 7.

I've got a 1k cathode resistor to ground from pin 8. I figure that should give 15 volts bias at 15 ma.

The heater supply is working as I expect.

I've got 280 volts on top of the CCS. There is about a 10 volt drop across the ccs with about 270 volts on the plate, obviously not what I want.

I'm not getting any bias voltage from pin 8 to ground which is where I'm expecting about 15 volts. Same in both channels, so I presumably have wired something incorrectly.

Any ideas?

ray
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Old 4th June 2011, 10:24 PM   #149
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Hi Ale;

Quote:
Originally Posted by mogliaa View Post
Hi Anatoly,
Congratulations for this superb design. I'm sure you're enjoying it!
I've traced the 4P1L triode strapped anode curves (see attached).
What is the bias point in your design?
220V A-K, -17V G1-K, 50 MA per tube. 5 W from paralleled pair. They are easy to parallel due to linearity and consistence.

Edit: sorry for late answer, I was in Az, at Grand Canyon then, and have not seen your posting.

May I add your graph to my page?
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Last edited by Wavebourn; 4th June 2011 at 10:38 PM.
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Old 4th June 2011, 10:31 PM   #150
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Quote:
Originally Posted by ratbagp View Post
I need a little help with a 4P1L line stage I am building. From the various plate curves I've seen I'm aiming at roughly 150 volts plate, 15 ma and -15 volts bias. The plate load is a a couple of cascoded DN2540's per channel similar to
Tube DIY Asylum - RE: Hooked up the Ixys IC CCS tonight - preliminary results - Tre' - July 11, 2009 at 22:13:45

The output of the ccs is connected to pins, 2, 3, 4.

The mu output of the ccs connects to a 2uf cap and thence to the output rcs socket.

I'm using a regulated 3.9 volt DC supply to power the heaters (pins 1 & 7). The supply is floating (simple LM317 to start with). I've got a 47uf cap across pins 1 & 7.

I've got a 1k cathode resistor to ground from pin 8. I figure that should give 15 volts bias at 15 ma.

The heater supply is working as I expect.

I've got 280 volts on top of the CCS. There is about a 10 volt drop across the ccs with about 270 volts on the plate, obviously not what I want.

I'm not getting any bias voltage from pin 8 to ground which is where I'm expecting about 15 volts. Same in both channels, so I presumably have wired something incorrectly.

Any ideas?
Hi Ray;

it looks like you've got absolutely dead tube. Even with 3.9V on filament instead of 4.2V it should draw enough of current.
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