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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
The YARRA Preamplifier/HPA for Melbourne DB Group Buy
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Old 9th July 2019, 10:46 PM   #751
ZUM911 is offline ZUM911  Australia
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Does anyone know what the pot boards fit? It looks like the smallest one is for the small ALPS and the big footprint for the large ALPS. Does the middle size footprint fit the TDK 2CP-601 Series?
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Old 12th July 2019, 02:37 AM   #752
xrk971 is offline xrk971  United States
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
The PCBs are in: WBA18-Yarra, PCA-Yarra, PCA-Aksa Lender format.

The YARRA Preamplifier/HPA for Melbourne DB Group Buy-waynes-ba3-preamp-pca-final-pcbs-jpg
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File Type: jpg Waynes-BA3-preamp-PCA-Final-PCBs.jpg (594.8 KB, 508 views)
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Last edited by xrk971; 12th July 2019 at 02:51 AM.
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Old 12th July 2019, 05:53 AM   #753
gary s is offline gary s  Australia
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Hi Rick,

The pot board marked with R221 will fit the TKD 2CP-601 pot (2.5mm x 5mm centres)

The board marked with R201 will fit the Alps Blue Beauty type pot (5mm x 10mm centres)

The board marked with R211 will fit the smaller pots - various brands with 2.5mm x 2.5mm centres.

Regards,

Gary..
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Old 12th July 2019, 06:56 AM   #754
ZUM911 is offline ZUM911  Australia
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Old 12th July 2019, 10:48 PM   #755
batty is offline batty  Australia
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Looking good.
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Old 13th July 2019, 07:08 AM   #756
xrk971 is offline xrk971  United States
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
I just verified that the Yarra PCA daughterboards work. I used 2SK209's for the JFET. Using the values for the source resistors in the table resulted in a much too high of a current of 190mA and the resistors started to cook. I found that using a pair of 2W 270ohm resistors in parallel (for 135ohms net) gave 122mA bias current and a reasonable amount of heating (1W per resistor) with a Vcc of 27.5v upstream of the CRCRC. The 2SK209 can take a higher supply voltage than the BF862. Listening to the output on headphones, it sounds great. Just the sound I expected from the PCA. The output noise measured with Fluke 101 was 0.0mVrms.

The YARRA Preamplifier/HPA for Melbourne DB Group Buy-yarra-pca-build-01-jpg

The YARRA Preamplifier/HPA for Melbourne DB Group Buy-yarra-pca-build-02-jpg

The YARRA Preamplifier/HPA for Melbourne DB Group Buy-yarra-pca-build-03-jpg

The YARRA Preamplifier/HPA for Melbourne DB Group Buy-yarra-pca-build-04-jpg

The YARRA Preamplifier/HPA for Melbourne DB Group Buy-yarra-pca-build-05-jpg
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File Type: jpg Yarra-PCA-build-01.jpg (301.4 KB, 357 views)
File Type: jpg Yarra-PCA-build-02.jpg (326.3 KB, 236 views)
File Type: jpg Yarra-PCA-build-03.jpg (380.6 KB, 233 views)
File Type: jpg Yarra-PCA-build-04.jpg (475.2 KB, 237 views)
File Type: jpg Yarra-PCA-build-05.jpg (526.4 KB, 406 views)
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Last edited by xrk971; 13th July 2019 at 07:18 AM.
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Old 15th July 2019, 01:59 AM   #757
xrk971 is offline xrk971  United States
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
All Yarra v2, WBA18’s, Ana PCA’s packed and labeled today. They ship out tomorrow.

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Old 15th July 2019, 03:46 PM   #758
xrk971 is offline xrk971  United States
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
I ran out of the nice 3M blue tape in the middle of packing stuff. So my apologies to some of you who may have some tape residue from clear tape holding your boards together. For the smaller WBA18's and PCA's I just dropped them loosely in the bubble mailer rather than taping them together.
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Old 15th July 2019, 03:56 PM   #759
bk856er is online now bk856er  United States
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The YARRA Preamplifier/HPA for Melbourne DB Group Buy
It's good to at least fold the pcbs tightly/individually in piece paper and tape over the paper. Nothing more annoying than getting pcbs all scratched up by rubbing together during the last leg of the long journey.

BK
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Old 15th July 2019, 04:03 PM   #760
xrk971 is offline xrk971  United States
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Shouldn’t be a problem as those are small and light boards in a large bubble padded envelope. I did tape most of them together. Let me know if it’s a problem.
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