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Old 8th December 2012, 05:02 PM   #1211
tubo is offline tubo  Philippines
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Good luck on your work Fellas,

Hopefully I can start with my new build with sshv2 soon. I have been happy with the 6v6 pre for many years without the sshv2. a little bit of hum with AC heaters but tolerable.
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Old 9th December 2012, 03:14 PM   #1212
DimZ is offline DimZ  Greece
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tried ss rectifier, IN4007 and a 100Ohm in series before c1, measured 440VDC with no load ...

tested SSHV2 ...

didnt have 8.5Κ dummy load, closest was 7.6K (series 4.7/2.2/0.68) ...

R4 was set to give stable 40mA, but with R11 fully turned I measured 291V across dummy load ...

will try later with 44mA to see if I get 340V across dummy (that is if I done the math correctly ) ...

the whole thing lasted about 5 minutes ... 2540 heatsink run quite hot, 840 heatsink was cold ...
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Old 9th December 2012, 06:05 PM   #1213
Salas is offline Salas  Greece
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Up your load value, its too heavy for your ccs setting.
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Old 9th December 2012, 06:16 PM   #1214
DimZ is offline DimZ  Greece
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i have also a 10k/50w resistor trying to find the right comp series/parallel for the dummy load ....

at least sshv2 seems to work ok, when fired up it was set to 140V , trimer adjusted up to 290V ...
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Old 9th December 2012, 06:21 PM   #1215
Salas is offline Salas  Greece
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Try 10K dummy, 55-60mA ccs.
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Old 9th December 2012, 06:37 PM   #1216
DimZ is offline DimZ  Greece
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will do that, thanks Nick ...
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Old 14th December 2012, 04:01 PM   #1217
DimZ is offline DimZ  Greece
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ss rectification (IN4007) ..

10k dummy - 58mA ccs
a nice 340V B+ ....... had to make a little R11 adjustment after 5 minutes ......

after 15 minutes 840 heatsink slightly warm ...
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Old 14th December 2012, 04:12 PM   #1218
Salas is offline Salas  Greece
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Looks like doing OK.
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Old 14th December 2012, 04:18 PM   #1219
DimZ is offline DimZ  Greece
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yeap,
couple of little things to solder , some cable management and should be ready to go ...
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Old 14th December 2012, 06:13 PM   #1220
mgreene is offline mgreene  United States
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Default SS vs Tube rectifier

DimZ, I am following your recent posts. Are you planning to do a listening test: IN4007 vs 274B? I would love to hear about that.

I have all the parts for my build but am on the fence about the rectifier - only because I was making an order from Antek and got a toroid for the Salas project too - but w/o a 5V winding.

Note that I am currently using my version of the "International Loesch" preamp which uses a soild state bridge and still sounds fabulous.

Mike
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