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Old 15th May 2012, 05:47 PM   #21
mattmcl is offline mattmcl  United States
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Evanc and Einric, you guys used a 230v xformer; but the manual seems to be recommending 300v for my tubes. Is this what I'd want?

Antek - AS-2T300
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Old 15th May 2012, 06:28 PM   #22
evanc is offline evanc  United States
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230vac, once rectified, should be over 300vdc. Then the r12 resistors will drop voltage to where you need it.
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Old 15th May 2012, 07:47 PM   #23
mattmcl is offline mattmcl  United States
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Ah yes. Thanks.

I'm thinking an 8A fast blow fuse on the IEC will be sufficient, just to protect against grounding issues. Did you guys use inline fuses for the different voltages?
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Old 16th May 2012, 12:14 AM   #24
Einric is offline Einric  United States
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I did not use any fuses other than the mains 2A slo-blow.

But now that you mention it I may just do that.
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Old 16th May 2012, 12:20 AM   #25
cjkpkg is offline cjkpkg  United States
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Remember, the preamp will only draw 30-50mA total so dont go putting too big a fuse. 1A or 2A at the most IMO...
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Old 16th May 2012, 12:23 AM   #26
cjkpkg is offline cjkpkg  United States
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Dont rule this one out...I used this on my Tetra Phono stage and if you are using SS rectification as the all in one kits or using a PS1 or PS3 this is an inexpensive good little unit

ALLIED 6K88VG
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Old 16th May 2012, 06:46 PM   #27
mattmcl is offline mattmcl  United States
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Right, typo on my part. I meant 2A fuse. Nice little transformer, but I already have the torodial ordered.

I see many recommendations for this pot: RK27112A00AK ALPS Potentiometers

The trick is, it's a 9mm diameter shaft, and I'm not finding many knobs that fit. I'm not sure of the differences between that one and this:

RK27112A-S20-C1-MN104 ALPS Potentiometers
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Old 16th May 2012, 07:16 PM   #28
Einric is offline Einric  United States
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Most 3/8" (9.375mm) shaft knobs will fit just fine.
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Old 16th May 2012, 07:34 PM   #29
cjkpkg is offline cjkpkg  United States
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This is the one I have used on a couple preamps I like it because it has the slotted shaft so the set screw on the knob holds better.

Here is the knob I use
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Old 16th May 2012, 09:49 PM   #30
mattmcl is offline mattmcl  United States
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Let me see if I understand how to calculate R12a and R12b.

On page 8 it says 6CG7 tubes will draw 2.6mA. Together that's 5.2mA per channel, or 10.2mA total. (I'm using four 6CG7's)

My transfo is 230vac, so 230X1.414=325.22, minus 2v for rectifier loss. So the transfo once rectified will deliver 323.22vdc. So I need to drop the voltage by 23.22vdc. According to the chart in the manual, R12a would be 3,000 and R12b would be 10,000.

Can you guys double check my figures here?
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