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Old 24th August 2010, 06:21 PM   #121
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BLUES sell matched one's only.
Spencer might be able to sell the whole lot for you.
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Old 24th August 2010, 06:28 PM   #122
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Try to contact Blues or Spencer for matched 2SK170-BL sets.

Blues
Matched Toshiba FETs For Sale

Spencer
Toshiba 2SK170BL for sales

I'm looking for a 12v relay too...
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Old 24th August 2010, 06:29 PM   #123
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Sorry Tea-Bag
You've posted while I was searching the links
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Old 24th August 2010, 06:33 PM   #124
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your post is better. I've used them from both sellers.
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Old 24th August 2010, 07:58 PM   #125
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Quote:
Originally Posted by TerryC View Post
Ordered this Friday from Digi-key...

Digi-Key - 255-1002-5-ND (Manufacturer - TQ2-12V)
Farnell in the UK have some 12v relays by Omron - the ones mentioned in the main BOM - Farnell part number 9949208 Gold plated, silver contacts, no less!
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Old 24th August 2010, 08:07 PM   #126
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OK - My DCB1 shunt is up and running with a 12-0-12 power supply that is more like 12.5-0-12.5 on the UK national grid.

Anyway, my rails are 9.1v DC and 9.06v DC, not the desired 10v, because my leds were merely max 1.8Vf, and actually read more like 1.7Vf on my meter. What's more, they are not quite as constant as the northern star. When measuring, they took some time to stabilise, and even then I am not convinced that they did stabilise fully - they measured slightly differently the next day. Normal? I don't know. They're Panasonic, but it seems they make some slightly crap stuff too.

Is 9.1v DC OK for a hotrodded DCB1? Should I get a 15v DC R-core transformer? Should I get new leds? What?

By the way, my matched fets are 6.85mA Idss, if it has any bearing on the matter.

Many thanks
Lucas
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Old 24th August 2010, 08:10 PM   #127
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I think it's the led's you need to take care of. Put another one in series and see if you can get it above 10v. you could also find a couple of green one's.
~1.9-2v
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Old 24th August 2010, 08:10 PM   #128
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Default BOM blue edition

I've got a quick question regarding this BOM.

Transistors BC-550 B or C = 2
BC-517 G = 1

Are they all required, or is BC-517 G an alternate for the BC-550 B/C?

Thanks,
JG
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Old 24th August 2010, 08:13 PM   #129
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Quote:
Originally Posted by LucasAdamson View Post
OK - My DCB1 shunt is up and running with a 12-0-12 power supply that is more like 12.5-0-12.5 on the UK national grid.

Anyway, my rails are 9.1v DC and 9.06v DC, not the desired 10v, because my leds were merely max 1.8Vf, and actually read more like 1.7Vf on my meter. What's more, they are not quite as constant as the northern star. When measuring, they took some time to stabilise, and even then I am not convinced that they did stabilise fully - they measured slightly differently the next day. Normal? I don't know. They're Panasonic, but it seems they make some slightly crap stuff too.

Is 9.1v DC OK for a hotrodded DCB1? Should I get a 15v DC R-core transformer? Should I get new leds? What?

By the way, my matched fets are 6.85mA Idss, if it has any bearing on the matter.

Many thanks
Lucas

It will work OK at 9V too. 9.5-10.5V was just my subjectively preferred region. Don't know if you will hear any difference. Technically yours its correct too. The Leds can settle thermally to some different point each time. But do you know its not part DVM's tolerance as well? What is your DC on the filter caps? So to tell you about the Tx. And what is the DC offset in mV on audio outputs? Any picture?
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Old 24th August 2010, 08:52 PM   #130
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Quote:
Originally Posted by merlin2069er View Post
I've got a quick question regarding this BOM.

Transistors BC-550 B or C = 2
BC-517 G = 1

Are they all required, or is BC-517 G an alternate for the BC-550 B/C?

Thanks,
JG
Yes both refs are required, you'll need :
1 - BC-560B or C - 1 unit (BC-556/7/8/9 are alternatives to BC-560B or C)
2 - BC-550B or C - 2 units
3 - BC-517G 1 unit (I'm using BC-517 without grade mentionned, depends on the manufacturer marking)
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