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Old 2nd November 2011, 05:24 PM   #631
diyAudio Member
 
Join Date: Sep 2009
Location: Spain
Hi,
My setup is tubeizator+ SShv for 6n2p tube. The materials are the same values ​​as the BOM list. I used the filter capacitor 220uf 450V + 470uF 450V.

The problem is that my transformer has a 230V primary (official voltage Spain) and my house gets 222-223V.
The measures in the secondary transformer 146-147V (loaded) and after grinding and filtering 204-205V.

When I connect the sshv the input voltage is162V-163V. If regulated to 150V output, i have a difference of 12v-13v between input and output in the ssh. I have read that has to be 20-25v​​.


My transformer has a secondary 0-150V 0.2A and 0-9V 3A.
I put an email to the manufacturer and advised me to add the secondary 150V 9V (159V total theoretical) to get more voltage. With 3A I have to spare.
I guess for the SSHV not get too hot I have to adjust for a difference of 25V. The output may be between 150V and 155V

How do you see?

Br

Al

Last edited by albertob; 2nd November 2011 at 05:39 PM. Reason: add info
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Old 3rd November 2011, 02:16 AM   #632
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Location: Montreal
Quote:
Originally Posted by albertob View Post
Hi,
My setup is tubeizator+ SShv for 6n2p tube. The materials are the same values ​​as the BOM list. I used the filter capacitor 220uf 450V + 470uF 450V.

The problem is that my transformer has a 230V primary (official voltage Spain) and my house gets 222-223V.
The measures in the secondary transformer 146-147V (loaded) and after grinding and filtering 204-205V.

When I connect the sshv the input voltage is162V-163V. If regulated to 150V output, i have a difference of 12v-13v between input and output in the ssh. I have read that has to be 20-25v​​.


My transformer has a secondary 0-150V 0.2A and 0-9V 3A.
I put an email to the manufacturer and advised me to add the secondary 150V 9V (159V total theoretical) to get more voltage. With 3A I have to spare.
I guess for the SSHV not get too hot I have to adjust for a difference of 25V. The output may be between 150V and 155V

How do you see?

Br

Al

Hi Alberto,

Could you post a picture of your hookup? This can help troubleshooting.

Ciao!
Do
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Old 3rd November 2011, 06:47 AM   #633
Wwan is offline Wwan  Malaysia
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Join Date: Dec 2006
Not sure about the rest, but for the AC in your house, you can try to check the power supply comparing day and night time. Normally night time is better and stable, in my home town.
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Old 3rd November 2011, 03:54 PM   #634
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Join Date: Sep 2009
Location: Spain
Thanks guys for the help.
I added the transformer secondary as directed by the manufacturer and get exactly the required voltage. I connected and everything went well ...

... But when you connect to both the 0-9V to heat the tubes, DISASTER!. A filter capacitor (3900UF 16V) is inflated and almost explodes. I turned off the electric current time. The capacitor closest to the star ground has been deformed. The rest looks good.
I reconnected each transformer secondary separately and it seems that everything works well, yet I will replace the damaged capacitor.

I think I connected well, anyway, I sent the transformer manufacturer and I will have to modify to get 160V.

I do not think that does more rare experiments.
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Old 16th November 2011, 06:13 AM   #635
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Join Date: Feb 2010
Location: Salem, OR
Quote:
Originally Posted by pinnocchio View Post
I just tried my Mullard E88CC (6922) with the switch set to 6N1P and I'm getting a really loud strident sound coming out of the speakers...

How did you get them to work on yours?

Did you get your resistors yet?

Ciao!
Do
Hi Do,

Sorry for the delayed response. I wanted some time to have 28R resistors to "burn in". After switching the resistors out, the instruments and vocals are much more separate and "spaced apart" from each other even after leaving the DAC on for 5 or more hours. It seems much better to me.

Regarding the 6922 tubes, I just put them in. I did nothing special. I of course set the heater switch to the 6n2P side though. I did not notice any strange sounds coming from the tubes in the DAC. Are you sure the Mullard E88CC's are not microphonic? What year are the Mullards. I have never heard a paire of E88CC Mullards before, but understand them to sound very nice (balanced, smooth, wide soundstage). Are you sure the heater voltage is set to exactly 6.3V? Also, is the voltage coming from the HV shunt boards exactly (or very close to) 150V?

Greg
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Old 16th November 2011, 03:09 PM   #636
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Quote:
Originally Posted by headrott View Post
Hi Do,

Sorry for the delayed response. I wanted some time to have 28R resistors to "burn in". After switching the resistors out, the instruments and vocals are much more separate and "spaced apart" from each other even after leaving the DAC on for 5 or more hours. It seems much better to me.

Regarding the 6922 tubes, I just put them in. I did nothing special. I of course set the heater switch to the 6n2P side though. I did not notice any strange sounds coming from the tubes in the DAC. Are you sure the Mullard E88CC's are not microphonic? What year are the Mullards. I have never heard a paire of E88CC Mullards before, but understand them to sound very nice (balanced, smooth, wide soundstage). Are you sure the heater voltage is set to exactly 6.3V? Also, is the voltage coming from the HV shunt boards exactly (or very close to) 150V?

Greg

Hi Greg,

Glad to hear the good news! I'm really happy as well with the 32R I put in. I'm using the volumite so I can adjust the output without using a preamp.

My shunt is set to 150V but only gets there when temperature settle in. It starts around 142V then climbs and stay still at 150V after about 10-15min.

The filament is 6.3V on the pin! I've used those E88CC on a X10 buffer with 35V supply and they shined even at low voltage. I also used them in a SP-10 preamp (260V) and they worked perfectly. They are OS tubes and I believe they're from the late 60's, early 70's era... But don't quote me on this. They're really smooth tubes. I don't know how different than my 12AX7 but would love to find out for sure...

Ciao!
Do
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Old 18th November 2011, 06:03 PM   #637
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Join Date: Sep 2009
Location: Spain
Hi,
My progress. I changed the transformer for a 25v difference between Vin and Vout in sshv.
I have adjusted to 151.5v Vout. The measures with the tubes placed (6n2p-ev) are:
L R
1. 151,5--------151,5
2. 76------------77
3. 76,4---------77,4
4. 6,3----------- 0
5. 0--------------6,3
6. 76------------77
7. 0 ------------ 0
8. 0,254--------0,248
9. 0 ------------0

Measured in volts. IS CORRECT?

Thanks
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Old 7th December 2011, 08:17 PM   #638
spas12 is offline spas12  United States
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If I'm located in US, then can I onlyorder one9V-0 / 2Atransformer and use mains 120V without a transformer?
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Old 14th December 2011, 02:46 AM   #639
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Quote:
Originally Posted by spas12 View Post
If I'm located in US, then can I onlyorder one9V-0 / 2Atransformer and use mains 120V without a transformer?
If you don't have a transfo you will need to limit the current in some way... The circuit calls for 150V 100VA if I remember correctly.

120V AC should give you close to 170V DC minus the voltage drop on the resistor near the filtering cap and the shunt reg. To me, a transfo is a must.

You should get something similar to this transfo
Antek - AS-1T150

Ciao!
Do
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Old 14th December 2011, 02:48 AM   #640
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Location: Montreal
Quote:
Originally Posted by albertob View Post
Hi,
My progress. I changed the transformer for a 25v difference between Vin and Vout in sshv.
I have adjusted to 151.5v Vout. The measures with the tubes placed (6n2p-ev) are:
L R
1. 151,5--------151,5
2. 76------------77
3. 76,4---------77,4
4. 6,3----------- 0
5. 0--------------6,3
6. 76------------77
7. 0 ------------ 0
8. 0,254--------0,248
9. 0 ------------0

Measured in volts. IS CORRECT?

Thanks
Hi Alberto,

Did you get it running? Sorry, I've been away of the thread for some time... Too busy lately!

Ciao!
Do
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