I meant brands of coupling caps and RIAA components , you must have tried few to come with some conclusions
Oh, sorry,
Yes, I've tried loads.
I like Clarity caps and Obligatto Golds for the output caps
I was not a fan of Audio Notes or Mundorfs.
I also liked LeClenche. But they arent made in the same place anymore so I cant say if they are any good.
Resistors, I have used a few...Yageo, Vishay, Multicomp etc...
I like to make sure the values are exactly matched per channel, other than that, I felt no need to go mad with resistors.
I haven't...
They are huge and wont fit on the PCB and I've never had a case big enough to get a pair in!
That was my thoughts but I'd need a bigger chassis. I usually build them quite compact.
My favourite resistors are Vishay 0.1% low temp coefficient , usually I additionally match them . Only time I have used z-foils was after being “accused “ of not having all necessary tweaks when comparing Paradise and Vida , which I found laughable as Paradise RIAA is +0.8/+0.6 @20-20kHz .
Not much preference as to caps and I found cheap Wima to be as good as expensive boutique ones but I’ll try Claritycaps.
Not much preference as to caps and I found cheap Wima to be as good as expensive boutique ones but I’ll try Claritycaps.
I’ll post a link when I get home , I order mainly from Mouser , use their filter and when you enter value it comes up with different options to choose from ie: tolerance , brand, temp coefficient, voltage rating , etc...
I felt I could "hear" the WIMA caps.
Like they were having a 'fluffy' effect. I cant describe it better but when they came out, so did the fluff.
However, I accept that it was most likely to be something completely unrelated or that was fixed inadvertently.
Still, I dont use them now anyway.
Clarity caps arent crazy money and sound great. Why not!
Would the Vishay 0.01% resistors the RC55y variety 15ppm.
Tiger are in Diss; Norfolk. Nice guy to deal with.
Tiger are in Diss; Norfolk. Nice guy to deal with.
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So they are my mistake.
I fired up my board today; no magic smoke and nothing appearing to get to warm. I know Alan posted re the voltages but as I am using 6DJ8 and 6N2P valves is there any difference in the readings?
I have the following measurements all relative to ground;
V1😛in1 90.6v; pin2 0v; pin3 3.17v; pin6 90.3v; pin7 0.8v; pin8 2.2v; between pins 4-5 6.27v.
V2😛in1 73.4v; pin2 0.9v; pin3 1.297v; pin6 79.6v; pin7 0.8v; pin8 1.156v; between 4-5 6.3v.
V3😛in1 215.8v; pin2 72.2v; pin3 78.3v; pin6 216v; pin7 86.9v; pin8 85.8v; between 4-5 6.34v.
Sorry for all the questions not used to valves.
Copied the BOM that Bigman posted on the GB thread. Thought it might be helpful to have it in this thread too 🙂
BOM MM-MC - Google Sheets
BOM MM-MC - Google Sheets
No problem, V1 is good.
V3 pins 3 and 8 'follow on' from V2 pins 1 and 6 so will always be of a similar value. However you seem to have a hot 6N2P that is taking quite a lot of current compared with an ECC83.
I suggest changing the 1.2k resistors for 2.2k and see how you get on.
Before attempting to swap the 1k2 resistor I thought I would try a different 6n2p valve and now have the following readings:-
pins 1 & 6 pins 3 & 8
V1 88 87.4 2.1 2.1
V2 118 118 0.8 0.8
V3 211 212 123.5 123.5
These appear to be within the 10% as mentioned by Bas am I good to go?
Also the outputs are fluctuating by several milli volts am I right in assuming that these will drop when the output is loaded by having a linestage connected?
tia.
pins 1 & 6 pins 3 & 8
V1 88 87.4 2.1 2.1
V2 118 118 0.8 0.8
V3 211 212 123.5 123.5
These appear to be within the 10% as mentioned by Bas am I good to go?
Also the outputs are fluctuating by several milli volts am I right in assuming that these will drop when the output is loaded by having a linestage connected?
tia.