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eXStatA Build Thread II - Page 5

post #61 of 567
Thread Starter 

Yes, this would be the right thing to do.

Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #62 of 567

OK, so it's desoldering time.  Happy to do so, actually, as it seems that I will be close to +/- 320V with the WHT-GRY connection.  Thanks.

 

(I will watch my head, Beefy....)

 

post #63 of 567

You might just be hearing some vibration because the tranny isn't bolted down. I use the McMaster-Carr PVC mounts, but any dampening should be fine (teflon or fibre washers, etc), but I bet when everything is bolted down, you won't hear it.

post #64 of 567

Yesss!  You guys are good.  With the WHT-GRY 115V 60HZ connection, I now have the following  readings:  Rails are +306.3 and -303.0.  T1 is +351.2 and T3 is -349.6.  Thank you very much! 

 

So, why is there an increase in these values when using less voltage from the transformer?

 

My son is certain now that his hum (I still can’t hear anything) is coming from the transformer.  So, I guess we’ll wait and see what happens once it’s bolted down and the amp is connected.

post #65 of 567
Quote:

Originally Posted by rbarth View Post

 

So, why is there an increase in these values when using less voltage from the transformer?


Transformers work as on 'fixed' ratios of how much they change the voltage.

 

A transformer with a 125V primary and a 250V secondary will increase the voltage 2x. So if your line voltage is 120V you get 240V out.

 

A transformer with a 115V primary and a 250V secondary will increase the voltage 2.17x. The same 120V line voltage becomes 261V out.

post #66 of 567

Where did the stax connectors get sourced from or were they a custom bui;d?

post #67 of 567

 

http://www.vacuumtubesinc.com/Products/SocketsAdaptersParts/NewOldStockTubeSockets.aspx

 

I'm guessing the 5-pin version would work? Otherwise you could try to contact woo audio for their jack.

post #68 of 567

The teflon and gold pin connectors were definitely a custom build from Luvdunhill, and Kerry has emulated this somewhat.

 

I have 22 of the original Amphenol connectors (now made by WPI) which I 'found' after shipping all the tubes while looking for some other parts. These were graciously donated by Frank Cooter, and I will pass them on (limit 2 each)... SHOULD have sent a pair with all the tubes, but had honestly forgotten these.

 

My (very) bad.

 

Please PM me for the connectors - but, customs forms really, really suck.

 

Again, my bad guys.

 

SJax.jpg


Edited by pabbi1 - 7/25/10 at 6:15pm
post #69 of 567

 

Can you suggest another connector (brand, type and where)?
 
Can I still buy custom connector from Luvdunhill as you mentioned above?
 
Thanks
post #70 of 567
Quote:
Originally Posted by neob View Post

 

Can you suggest another connector (brand, type and where)?
 
Thanks

 

 

These two look to be correct 

http://www.alliedelec.com/Search/ProductDetail.aspx?SKU=7190012&MPN=78-S6S&R=7190012&SEARCH=7190012&DESC=78-S6S

http://www.surplussales.com/Connectors/Microphone-6.html   (6 pin version at bottom of page)

 

I emailed www.vacuumtubesinc.com and they are out of stock and don't know if or when they will have them again.

post #71 of 567

Those are correct - if you can source locally, that is your best bet. Looking at a package to OZ (and East) if we can work out logistics of a single ship from here. I have about 16 left, as of this morning, and will hold all other requests until we sort the Oz builders, as they asked first, and I should have sent some there with the tubes.

post #72 of 567

I believe that you have sent my tubes... 

 

If you have not sent my tubes yet, i'll be so glad to get the connector from you.

post #73 of 567

I am now wiring and need some help with the following:

 

(1)  I understand that the positive and negative signals connect to the input pins on the pot and then go from the output pins on the pot to the corresponding terminal blocks on the amp board.  What I’m not getting is how to connect the two input ground wires coming from the XLRs to the common pins on the pot and then to the two input ground terminals on the amp board. (I’m using a quad pot so obviously there are four common pins.)

 

(2) There is an fourth, unnumbered pin on the XLRs that I’m also uncertain about.  Is this the ground for the XLR connector?  If yes, where I do ground it to?


Edited by rbarth - 7/26/10 at 4:20pm
post #74 of 567
Thread Starter 

Are you using two 3-pin xlr connectors? Or 4-pin jobbies?

 

If 3-pin there is a wiring diagram on the exstata website that shows this wiring.

Dr. Cavalli gained notoriety with his first DIY amplifier projects. His success has blossomed into Cavalli Audio, a world leader in amplifier design.
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post #75 of 567

I used the one specified on the BOM   It has three pins in a triangular shape numbered 1, 2 and 3 and one smaller, unnumbered tab on top of them that has a small hole in it.  I have checked the wiring diagram and regret to say that I am not experienced enough to determine whether the answer to my question is there.  I have never wired a balanced connection before.  In the past, I have wired the ground from the inputs to the the pot I was using and then ran it from there to the amp board.  Is this the same case with balanced inputs?  If yes, I have two ground wires and four common tabs on my pot.  How do I connect this?  

 

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