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Old 8th August 2009, 06:20 PM   #1031
johnm is offline johnm  United Kingdom
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Hey Bill!

Thanks for clearing that up - one last thing, do I take it that 1 and 6 goto the + and - points on then DAC, and they're not tied together as indicated on the UTC transformer casing?

Sorry if this is a painfully silly question, I just don't want to make any mistakes

Cheers,

- John
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Old 8th August 2009, 06:31 PM   #1032
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That is not a silly question but I dont have a pic at hand so I am going by memory. 1,2,and 3 are the connections to one primary winding, 4,5,and 6 are the second primary winding. Connecting 3 to 4 connects the two windings in series so 1 and 6 go to the dac plus and minus. If the can shows something different you will have to post a pic.
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Old 8th August 2009, 06:52 PM   #1033
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I just found a pic of the A20s, it shows CONNECT TO 1 and 6, that does not mean connect them together, you use them for your external connections. It also says tie 3 and 4, ct which means you can use that point for a center tap but you dont need a center tap, so just tie 3 and 4 together.

Bill
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Old 9th August 2009, 03:26 AM   #1034
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Default UTC wiring

I gave the link on post #940 for UTC transformers:

http://www.bunkerofdoom.com/xfm/UTC_...RMLS95750M.PDF
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Old 9th August 2009, 11:42 AM   #1035
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Default Re: UTC wiring

Quote:
Originally posted by crazyfrog
I gave the link on post #940 for UTC transformers:

http://www.bunkerofdoom.com/xfm/UTC_...RMLS95750M.PDF
Thanks for reposting that, it's nice to have.
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Old 9th August 2009, 11:50 AM   #1036
johnm is offline johnm  United Kingdom
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Thanks for clarifying the connections Bill - appreciate it

Thanks also for that PDF Crazyfrog.

- John
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Old 9th August 2009, 01:09 PM   #1037
legarem is offline legarem  Canada
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Quote:
Originally posted by piero7
Hi legarem thanks for the infos, and a comparation A-20 HA-108? More basses due big core, and the rest?

I haven't done any comparaisons between the A-20 and HA-108. I bought the HA-108 and GA80080 after one of my friends gave me the information about vintage transformers best buys. Here is the list.

WE 111C
WE 119C
WE 111D
WE 93F
UTC HA-108(X)
Yamaha Tamura GA80080

I never tried western Electric transformers (WE) because they will probably cost you an arm if you can find them.
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Old 9th August 2009, 06:11 PM   #1038
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Legarem; what about Lundhal againts Tamura and HA 108 ?
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Old 9th August 2009, 09:46 PM   #1039
legarem is offline legarem  Canada
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Quote:
Originally posted by Praudio
Legarem; what about Lundhal againts Tamura and HA 108 ?

With the Lundahls, everything is perfect. They goes low and high, the soundstage is really good. They're the champion in definition.

HA-108 are like being in a smokey jazz bar with live music.

Tams are more like Lundahls but don't goes as low. They lack a little bit of definition when compared to Lundahls

I tried a newcomer which has bad looks but measured exceptionnally well in square waves with or without any load. When listening them, I would describe them as a mix of Lundahl and UTC.

As I would like to find another pair, I'll give news about this newcomer later.

The resistors between the dac and transformers can taylor the sound to your taste. Riken or AB carbon will mellow the sound. Metal film will gives more detail.

DIY is fun because you can make gear which is in synergy with your system.
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Old 10th August 2009, 03:17 PM   #1040
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Default UTC A-20 Transformer

Hello!

I just bought a pair of UTC A-20. I'm going to wire them up as per the Jensen Layout. Does anyone here know what the best Cap/ Resistor combo is for the RC network on the secondary? I read somewhere its for the best square wave response though I'm not sure if its important or not.
Any suggestions?

Br,

Rgrieg
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