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How to connect a Denon AU-320 step-up MC transformer
How to connect a Denon AU-320 step-up MC transformer
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Old 19th June 2019, 09:49 PM   #1
355F1 is offline 355F1  United States
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Smile How to connect a Denon AU-320 step-up MC transformer

Hello,

I have a preamp that has four banks of micro switches for gain and input impedance. They are adjusted for my Denon DL 103R.

I have decided to add another deck that also has a 103R but comes with a Denon AU-320 step-up transformer.

My question is, should I reset the micro switches to 0 when inserting the transformer or will it automatically defeat the present set-up?

Is there another way to connect the transformer to avoid the cumbersome task of setting the switches back and forth when I switch from turntable A to turntable B?

Many thanks,

Horacio

Last edited by 355F1; 19th June 2019 at 09:51 PM.
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Old 20th June 2019, 02:27 PM   #2
Mark Tillotson is offline Mark Tillotson
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Does the transformer output use the MM input to the preamp perhaps? If not then yes you'll probably have to reset the switches each time. They tailor the preamp to a particular cartridge.


Other approaches:

1) remove the transformer
2) add a similar transformer to other deck
3) get a 2nd preamp



BTW: You mean DIP switches, not microswitches. This is a microswitch: Z15GW2BOMI | IP00 Snap Action Limit Switch Roller Lever, NO/NC, 500V | RS Components
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Old 20th June 2019, 08:24 PM   #3
6L6 is offline 6L6  United States
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How to connect a Denon AU-320 step-up MC transformer
Quote:
Originally Posted by 355F1 View Post
My question is, should I reset the micro switches to 0 when inserting the transformer or will it automatically defeat the present set-up?
Most likely yes.

Why preamp is it? That will help answer the question more accurately.

Quote:
Originally Posted by 355F1 View Post
Is there another way to connect the transformer to avoid the cumbersome task of setting the switches back and forth when I switch from turntable A to turntable B?
No.
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Old 21st June 2019, 10:06 PM   #4
355F1 is offline 355F1  United States
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It is a Klyne Series 6
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File Type: jpg Klyne_3.JPG (435.0 KB, 73 views)
File Type: jpg IMG_1763_resize.JPG (335.5 KB, 70 views)

Last edited by 355F1; 21st June 2019 at 10:33 PM.
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Old 22nd June 2019, 02:12 PM   #5
AVWERK is offline AVWERK  United States
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The Klynes were excellent preamps of their era.

Having owned the Denon transformer at one time in the 80,s it was not a particular good transformer to mate with an MC. Poor bass response and no micro detail

What you need is the Klyne head amp that had many adjustments and would mate perfectly as a secondary system plus another phono stage to plug into the aux or line section of the SK6

Klynes were excellent pieces

Regards
David
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Old 22nd June 2019, 02:20 PM   #6
6L6 is offline 6L6  United States
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How to connect a Denon AU-320 step-up MC transformer
Quote:
Originally Posted by AVWERK View Post
Having owned the Denon transformer at one time in the 80,s it was not a particular good transformer to mate with an MC. Poor bass response and no micro detail
I have to ask, why would a MC step-up transformer not be a good mate with a MC cartridge?



355F1 -

The AU-320 is one of the better Denon SUT, I'd absolutely give it a try. With the 103 series you'll want it set to the 40ohm position (1:10)

If you find it has "Poor bass response and no micro detail", I'll happily take it off your hands.

Your Klyne preamp looks fantastic!
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Old 22nd June 2019, 02:34 PM   #7
AVWERK is offline AVWERK  United States
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Just that particular one
When I got the Verion trans (Cotter) it was easy to hear a steep improvement over it.
Transformers are excellent gain devices and there are good ones and great ones

At least at their worst, they are relatively easy on the ear unlike some head amps that can get hard sounding
The Kylne was a break thru back then and the recommendation

Just personal experince from that combination

Regards
David
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Old 27th June 2019, 04:52 PM   #8
355F1 is offline 355F1  United States
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Chaps,

I should have been more clear regarding the use of the Denon transformer, it seems that I opened a can of worms here.

A friend gave me a Thorens TD 125/SME/3009/Denon AU320/DL-103R. I already have a great deck but wanted to try the 320/103 combination and not delve into what transformer is better.

The phono preamplifier for System Six is ​​factory-installed in the 6LE3.5 / P model. The universal application is obtained with an adjustable gain of 37, 50 or 63 dB at 1 kHz. The input impedance is adjustable between 100 and 47K Ohm. An adjustable high-frequency contour network is incorporated into the cartridge loading circuit which has a load dependent on the frequency of the cartridge to dampen the high-frequency resonances of the MC cartridges. It has a superb head amp with unlimited asjustments.

The Verion/Cotter is a brilliant transformer, sold for $3K in the early eighties and it still sells for more than $2K on ebay, the Denon was relatively inexpensive, ten times cheaper than the Verion.

Cheers,
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Old 27th June 2019, 05:56 PM   #9
waltube is offline waltube  Italy
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The DL103 R ha 14 ohm impedance.
The 320 is very ggod but I think you must adjust the reflected impedance.
Now if you have 47k on phono you get 470 ohm reflected on primary.
The phono has the switches and if you are able to set for 22 kohm (p.e.) you will get a better match. Also 15 kohm ( 150 ohm reflecetd9
In case you can use a T adapter on cable goes to phono stage so it is possible to put a male rca jack with a resistor soldered.
in parallel with 47k


Walter
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Old 28th June 2019, 01:10 AM   #10
AVWERK is offline AVWERK  United States
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The Verion/Cotter is a brilliant transformer, sold for $3K in the early eighties and it still sells for more than $2K on ebay, the Denon was relatively inexpensive, ten times cheaper than the Verion.

Cheers,[/QUOTE]

In 1979 the Cotter mk2 sold for 425$ and it never rose anywhere near 3k in the 80,s.

What I do remember how colored the 320 was when compared, switching them in and out.
Sold it immediately after that.


Regards
David
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