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Old 12th February 2013, 08:16 PM   #171
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Using Kz instead of ELna Silmic II brings the kit price to $57 for a stereo pair. The Cinemag transformers will add $53. If turn out for them is really good, over 50 pieces, the price will drop to outstanding $51. Here is a pic of the mighty 3299 pot. Mack daddy of all pots.

Using the 3296 will save $2 off total kit price, as they are $.25 cheaper than 3299
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Last edited by buzzforb; 12th February 2013 at 08:19 PM.
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Old 13th February 2013, 07:56 AM   #172
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Talking about the part GB, I know that blue leds are prettier, but wouldn't a fast zener be a wiser choice? I mean noise-wise.
About the 1000uF caps, what voltage rating are we talking about?
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Old 13th February 2013, 02:25 PM   #173
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Oh and Mike is there any BOM or schematic for the PSU boards?
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Old 13th February 2013, 02:27 PM   #174
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Quote:
Originally Posted by dimkasta View Post
Talking about the part GB, I know that blue leds are prettier, but wouldn't a fast zener be a wiser choice? I mean noise-wise.
About the 1000uF caps, what voltage rating are we talking about?
I believe 25 or 35V is what I picked. I have a kit for PSU associated with the F5T GB if you are interested.
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Old 13th February 2013, 03:31 PM   #175
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Nah I still have many parts from your previous F5T GB that are still waiting in their bag. I just wanted to have a look at a typical implementation of the white PSU boards. The photos on the blog are not very clear on that.

By the way, any chance that you can try a zenner on your test rigs and see if there is an improvement from the two blue leds?
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Old 13th February 2013, 03:52 PM   #176
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LEDs tend to be lower noise than Zener, from what I understand. I don't know where blue fall in the noise spectrum, but I don't think that led color will be having a heat effect in this particular amp. Could be wrong of course.
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Old 13th February 2013, 04:53 PM   #177
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I m just insisting because I had a huge improvement by changing the blue/white led with a red non super bright one one on my DCB1's power indicator.
From a test here in diyaudio I remember that certain zeners where closer to plain leds and quiter than blue ones. And since we we have to use two blue ones, I guess the noise builds up

Here s the link to the test. If you check it, at some points zeners were almost 4 times quiter than blue leds.

http://www.diyaudio.com/forums/attac...amp=1087235682
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Old 13th February 2013, 05:40 PM   #178
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I know red and green are the quietest. There is nothing keeping you from using a zenerif you choose. I have SS fets, so its not something I have looked into. I will include some zeners so that folks have an option.
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Old 13th February 2013, 06:16 PM   #179
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Quote:
Originally Posted by buzzforb View Post
PLease post pics of boards. IF you pull the pots, you must jumper that position. Pull the mosfets, and test just the bias section. Post pics first as we may be able to spot something. You can test continuity on the board with DMM any questionable location.
So I took another measurement on the board with the MOSFETs pulled. I could only get the bias at the gate pin on the board to read 0.5V with the pot at max. Something is not allowing the possible 5.5V available to get to the gates.

Either something is up with the Cinemags / daughter board or I have a resistor with a wrong value...UGH...
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Old 13th February 2013, 06:50 PM   #180
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Measure voltage across R3 and R4
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