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6V6 line preamp
6V6 line preamp
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Old 27th December 2017, 01:51 AM   #3321
king4joy is offline king4joy  Hong Kong
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Thankyou Salas.

Cheers.
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Old 13th February 2018, 11:36 AM   #3322
skrstic is offline skrstic  Serbia
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Hi. LED1 2mA or 10mA ?
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Old 13th February 2018, 11:40 AM   #3323
Zen Mod is offline Zen Mod  Serbia
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6V6 line preamp
as I said ....... there is no categorization of LEDs primarily by current

they're either "normal" (older) ones , or newer existing - high current range

it's easy to check , with 9V battery and resistor
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Old 13th February 2018, 05:45 PM   #3324
bequerel is offline bequerel  Norway
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Quote:
Originally Posted by Vbenonisen View Post
Nice to see that Shindo also use 6V6 in the output of the Vosne Romanee L preamplifier. There is a tube before it, probably capacitor coupled and with parafeed output transformers, but very nice all the same.

The tube before is 6AW8, I think. Parafeed is extremely rare in Japanese gear.
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Old 27th February 2018, 07:50 PM   #3325
Cambe is offline Cambe
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Is their a off the shelf transformer and choke that suits this project or other source for them?
Thanks.
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Old 22nd March 2018, 08:22 AM   #3326
skrstic is offline skrstic  Serbia
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Quote:
Originally Posted by Salas
Quote:
Originally Posted by skrstic
Hi Mr. Salas.

I do not know anything about electronics, so I apologize if my questions are stupid.
My parts list is
power
-1 x trafo
340V-0-340V (250mA)
5V (3A)
10V (1A)
10V (1A)

-1 x 5C3S(5Ц3С) tube

-2 x coils 10H

-capacitors
1 x motor-run 4uF
2 x 220uF

I borrowed 2 Russian 6V6 tubes from a friend. Heating is grec-22000uf-lm317.

High voltage looks like:

Click the image to open in full size.
(caps are 220uF)

Questions:
1) I need 1 or 2 SSHV?
2) In PSU Designer load should be resistive or constant current?
3) What value should I put? (constant current 22mA+22mA tubes + 20mA SSHV2 = 64mA)
4) What value R to put on SSHV2 dummy load (340V/0.044mA=7727.27R)?
5) On SSHV2 on TP pads should be 440mV (if 1 is used)?

Thanks in advance. Slobodan.
Hello Slobodan

Please post that questions text to the 6V6 thread so more people can answer or benefit from answers. Since its about things that many others would have questioned too.
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Old 22nd March 2018, 08:40 AM   #3327
skrstic is offline skrstic  Serbia
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From first 45 pages (correct me if I'm not accurate)

1) I need 1 or 2 SSHV?
answer - 1 SSHV2 for regular stereo preamp, 2 x SSHV2 as dual mono or something like.

2) In PSU Designer load should be resistive or constant current?
3) What value should I put? (constant current 22mA+22mA tubes + 20mA SSHV2 = 64mA)
answer - constant current
-65mA four 2 x 6V6 + 1 SSHV2
-42-45mA four mono 1 6V6 + 1 SSHV2
(1 lamp 6V6 is around 22mA depending on manufacturer and 1 SSHV2 is 20mA)

4) What value R to put on SSHV2 dummy load (340V/0.044mA=7727.27R)?
answer - 7k7 for stereo and 17k mono

5) On SSHV2 on TP pads should be 440mV (if 1 is used)?
answer - 440mV for stereo and 220mV

Please double check my answers.
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Old 22nd March 2018, 10:56 AM   #3328
nikosokey is offline nikosokey  Greece
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More pics

My friend Skrstic its better to waiting an answer from Nick (Salas).
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Last edited by nikosokey; 22nd March 2018 at 11:01 AM.
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Old 22nd March 2018, 12:13 PM   #3329
Salas is offline Salas  Greece
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6V6 line preamp
Quote:
Originally Posted by skrstic View Post
From first 45 pages (correct me if I'm not accurate)

1) I need 1 or 2 SSHV?
answer - 1 SSHV2 for regular stereo preamp, 2 x SSHV2 as dual mono or something like.

2) In PSU Designer load should be resistive or constant current?
3) What value should I put? (constant current 22mA+22mA tubes + 20mA SSHV2 = 64mA)
answer - constant current
-65mA four 2 x 6V6 + 1 SSHV2
-42-45mA four mono 1 6V6 + 1 SSHV2
(1 lamp 6V6 is around 22mA depending on manufacturer and 1 SSHV2 is 20mA)

4) What value R to put on SSHV2 dummy load (340V/0.044mA=7727.27R)?
answer - 7k7 for stereo and 17k mono

5) On SSHV2 on TP pads should be 440mV (if 1 is used)?
answer - 440mV for stereo and 220mV

Please double check my answers.
1. One SSHV2 set at circa 60mA CCS can handle two channels. But reconfigure it in two wire mode because the consumption nodes will spread. Two wire mode is short at its output connector legs the F+ and S+ together as well as the F0 and S0 together thus have classic +V 0 two wire output, not Kelvin four wire.

Also use IXYS higher voltage DMOS instead of DN2540 Q1 for more safety since the Vinput is close to the DN's limit in this application. Nikos will kindly remind us the exact IXYS type he put.

2. CC load in the simulator since it remains steady as you change other things

3. Put 60mA because the real tubes usually pull little less than the 22mA per unit prediction

4. Correct. But no need to hit exact mA in this work OK and sinks heat OK preparatory test with dummies. Go with practical dummy resistor values that you can actually find in shops. Go for less mA than more mA when you got to use about values.

5. Should show the total CC current you set. 10mV = 1mA. 600mV for 60mA for example. The newer boards have extra printed directions for quite some time now.
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Old 22nd March 2018, 01:05 PM   #3330
merlin el mago is offline merlin el mago
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Salas the reg uses feedback?
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