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Old 16th February 2014, 06:58 AM   #1131
Junie is offline Junie  Philippines
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Hello to all.

I recently acquired a set of boards (13 pieces) of this mighty preamp. I gathered most of the documents but I noticed the BOM for the input selector/ladder attenuator is not available. I tried all the links posted on this thread but all of them are DEAD, anyone with the documents kindly send it to me please. Thanking you in advance.

Cheers,
Junie
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Old 16th February 2014, 10:02 AM   #1132
NYCOne is offline NYCOne  United States
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Quote:
Originally Posted by Junie View Post
Hello to all.

I recently acquired a set of boards (13 pieces) of this mighty preamp. I gathered most of the documents but I noticed the BOM for the input selector/ladder attenuator is not available. I tried all the links posted on this thread but all of them are DEAD, anyone with the documents kindly send it to me please. Thanking you in advance.

Cheers,
Junie
Junie raises an interesting question. Why not a second buy of PCBs. Perhaps not all 13, but is there interest for the preamp modules? Or, perhaps people are interested in all the PCBs?
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Old 16th February 2014, 10:28 AM   #1133
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by Junie View Post
Hello to all.

I recently acquired a set of boards (13 pieces) of this mighty preamp. I gathered most of the documents but I noticed the BOM for the input selector/ladder attenuator is not available. I tried all the links posted on this thread but all of them are DEAD, anyone with the documents kindly send it to me please. Thanking you in advance.

Cheers,
Junie
Here you go Junie, Cheff's own plus attenuator calculator:
Attached Files
File Type: zip BOM.zip (25.2 KB, 81 views)

Last edited by CeeVee; 16th February 2014 at 10:31 AM.
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Old 16th February 2014, 10:35 AM   #1134
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by NYCOne View Post
Junie raises an interesting question. Why not a second buy of PCBs. Perhaps not all 13, but is there interest for the preamp modules? Or, perhaps people are interested in all the PCBs?
That might be a good idea, this is a fantastic preamp....had mine for ages and it still makes my day ...it's perfectly doable with the new LSKs or matched 2SK170 and 2SJ74's.
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Old 16th February 2014, 10:57 AM   #1135
Junie is offline Junie  Philippines
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Hi Carlos,

thanks for early reply, but the specific part number of the Relay for the input selector and attenuator is not listed.

Thanks,
Junie
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Old 16th February 2014, 11:13 AM   #1136
CeeVee is offline CeeVee  Portugal
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Quote:
Originally Posted by Junie View Post
Hi Carlos,

thanks for early reply, but the specific part number of the Relay for the input selector and attenuator is not listed.

Thanks,
Junie
There are plenty of options but the one most of us used was the one from GB since that gave us a great price: OMRON G6S-2G-Y
24VDC
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Old 16th February 2014, 11:26 AM   #1137
Junie is offline Junie  Philippines
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Thanks Carlos, so it's the same relay used in input selector and Attenuator?
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Old 16th February 2014, 11:33 AM   #1138
CeeVee is offline CeeVee  Portugal
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yep!..be carefull that you have the power supply adapted for the relays you intend to use!...you can use whatever voltage you want; 12V or 24 but power supply has to correspond.

Last edited by CeeVee; 16th February 2014 at 11:37 AM.
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Old 16th February 2014, 12:01 PM   #1139
Junie is offline Junie  Philippines
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Noted, will use 24v then.
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Old 17th February 2014, 06:39 AM   #1140
Junie is offline Junie  Philippines
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Hello again,

Kindly confirm as per the BOM the below part in red is 2x9V but in power supply PCB it's 2x24v, which one is correct?

TRANSFO. 5VA 2x24v2Farnell4384891TRANSFO. 16VA 2x9v1Farnell1214612
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