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Old 7th February 2009, 01:48 PM   #11
Brit01 is offline Brit01  United Kingdom
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Quote:
(available from Ebay seller Audiotek *** - a wellknown scammer)



Don't tell me this. I've just bought a load of caps among other stuff from them a couple of weeks ago.

Tell me. How do they scam people?

Now I'm just reading this:

The fleabay-scam thread

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Old 7th February 2009, 02:45 PM   #12
Brit01 is offline Brit01  United Kingdom
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well my first order was on the 10th Jan and nothing yet.

I just wrote to them and they replied in 10 mins saying they will ship the item again with a free item up to a value of 10USD. Sounds too good to be true.

I have 45 days to open a dispute with paypal. I will wait a little longer and open a dispute before the 45 days just in case.
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Old 7th February 2009, 03:34 PM   #13
Sheldon is offline Sheldon  United States
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Quote:
Originally posted by Brit01
Most of the designs seem to use 2 separate tubes, one for each channel. If there is no crosstalk involved I'd like to use the 2 triodes in one tube.
Do I need a twin triode with a screen to implement this design? The article that leadbelly included states there are 2 types of 6N6P.
Crosstalk (or the lack thereof) is overrated. Anyone who listens to vinyl is limited by the separation of the cartridge, which is 30dB tops, usually less. It would be a rare tube which does not have better separation than that. You will also see many amps with a single input or driver tube, comprising a dual triode, with or without (usually without) a screen. Whatever crosstalk is there won't be audible under stereo listening.

Sheldon
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Old 7th February 2009, 03:42 PM   #14
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Quote:
Originally posted by Brit01
What software did you open this with?
Do I need a twin triode with a screen to implement this design?
.mdi just stands for "microsoft digital imaging" or something like that. It opened on mine without installing anything, but I have all the MS Office addons installed.

Don't worry about the screen. There are already some threads debating this if you want to search.

Quote:
Originally posted by Brit01
But I'm trying to keep the circuit as simple as possible without sacrificing performance too much.
This is getting a little too complicated.
The guys here normally eschew 3pin regulator based CCSs because they are lower performance than discretes. IMHO, you might be happy with a circuit that has an LM317 or 10M45 for a CCS. Pretty simple, 1 unit with 1 or 2 resistors.
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Old 7th February 2009, 04:23 PM   #15
dBel84 is offline dBel84  United States
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I don't often post over here but I have built the buffer linked below (a variation off) - just to keep options open..dB
http://www.cavalliaudio.com/oclbuffe...?page=overview

....hope the ebay deal works out
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Old 7th February 2009, 06:00 PM   #16
Brit01 is offline Brit01  United Kingdom
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Quote:
IMHO, you might be happy with a circuit that has an LM317 or 10M45 for a CCS. Pretty simple, 1 unit with 1 or 2 resistors.

Not sure if this is the way to go. I checked out several articles and took this from glass-ware and incorporated into my circuit.

R3 and C2 I'm not sure about.
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File Type: jpg stereo buffer with lm317 ccs.jpg (41.8 KB, 935 views)
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Old 7th February 2009, 06:03 PM   #17
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Quote:
But I'm trying to keep the circuit as simple as possible without sacrificing performance too much.
Then use the 10M45S integrated circuit. The data sheet is here.
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Old 7th February 2009, 06:55 PM   #18
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keep it simple. there's actually nothing inherently evil about a resistor based cat follower with two caps in the signal path. a bad CSS will sound real dodgy, imho
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Old 8th February 2009, 01:32 PM   #19
Brit01 is offline Brit01  United Kingdom
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Hi guys,

Modified circuit with the CCS LM317. Really not sure if its incorporated correctly for a CF.
Not sure if the bypass cap is necessary either.
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File Type: jpg stereo buffer with lm317 ccs.jpg (41.8 KB, 827 views)
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Old 8th February 2009, 02:01 PM   #20
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I have my doubts about using a regulator IC. OTOH, the 10M45S has achieved considerable popularity among DIYers. More than 1 set of ears indicate the use of the application specific IC.

Let's see if the circuitry can be simplified. A 10M45s and its associated passive parts for the cathode load. A stack of red LEDs directly under the cathode for bias. The CCS sits between the LEDs and ground. Make R4 50 KOhms. R3 sits between the grid stopper and the LED stack/CCS junction. Make R3 511 KOhms.
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