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Old 2nd January 2012, 11:20 AM   #41
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I know this thread is a little old, but if anyone bypasses the output stage, the 1uF phono section caps look symmetrically mounted, but are not! That's why I only had output on one channel. Doh!
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Old 14th February 2012, 01:39 PM   #42
frapa02 is offline frapa02  United Kingdom
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Actually, the output stage is the problem with this pre-amp. I concluded in the end that it was colouring the sound too much and would take too much to mod so I replaced my Yaqin with something more suitable. These are difficult to access and work on. The phono pre part is actually very good.

For the person who used 6N1P for the ECC83 / 12AX7 you should try a 6N2P as this has more gain which is needed in the first stages and will be more correctly biased with the fitted components as it is close to the 12AX7.

6N1P or 6N23P would be good in the output stage but would entail changing the heater wiring and the bias. Same goes for an ECC88 or 6DJ8.

Paul.
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Old 16th February 2012, 12:33 AM   #43
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Quote:
Originally Posted by awkwardbydesign View Post
I know this thread is a little old, but if anyone bypasses the output stage, the 1uF phono section caps look symmetrically mounted, but are not! That's why I only had output on one channel. Doh!
I changed my 1uF output bypass caps and didn't have any issues with a dead channel. Currently not running this pre tho. My re-built Citation 17 sounds better with my CDs and a DIY pono preamp.

Cheers,
Bob
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Old 16th February 2012, 03:15 PM   #44
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Quote:
Originally Posted by awkwardbydesign View Post
I know this thread is a little old, but if anyone bypasses the output stage, the 1uF phono section caps look symmetrically mounted, but are not! That's why I only had output on one channel. Doh!

Everyone that owns this Yaqin should take a look at the Volume pot. Mine went bad and killed a channel. There is no sense in upgrading the Caps if you got it going thru a 2 dollar volume pot.
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Old 17th February 2012, 12:20 AM   #45
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Quote:
Originally Posted by migkiller1971 View Post
Everyone that owns this Yaqin should take a look at the Volume pot. Mine went bad and killed a channel. There is no sense in upgrading the Caps if you got it going thru a 2 dollar volume pot.
What did you use for a replacement?

Cheers,
Bob
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Old 29th February 2012, 05:52 PM   #46
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Quote:
Originally Posted by bobrown14 View Post
What did you use for a replacement?

Cheers,
Bob

A Japanese Alps Volume Pot.
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Old 29th February 2012, 11:14 PM   #47
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Quote:
Originally Posted by migkiller1971 View Post
A Japanese Alps Volume Pot.
Linkey??

Cheers,
Bob
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Old 14th April 2012, 06:15 PM   #48
morme is offline morme  United States
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Default How to rewire for 6V heater tubes

can you please let me know how to do this? did you run the 2 tubes in series off one supply?

any pix of the mod?

Thanks


Quote:
Originally Posted by jonners View Post
I wasn't happy with the 12AX7s, and I'm now happily using Soviet 6N1P tubes. Very cheap, reliable and sound good. But that involved a change in the heater wiring because of the 6.3 volt heaters.
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Old 3rd May 2012, 02:21 AM   #49
hunsoop is offline hunsoop  United States
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Join Date: Mar 2008
Location: dallas,TX
Default heater wiring

Quote:
Originally Posted by frapa02 View Post
Actually, the output stage is the problem with this pre-amp. I concluded in the end that it was colouring the sound too much and would take too much to mod so I replaced my Yaqin with something more suitable. These are difficult to access and work on. The phono pre part is actually very good.

For the person who used 6N1P for the ECC83 / 12AX7 you should try a 6N2P as this has more gain which is needed in the first stages and will be more correctly biased with the fitted components as it is close to the 12AX7.

6N1P or 6N23P would be good in the output stage but would entail changing the heater wiring and the bias. Same goes for an ECC88 or 6DJ8.

Paul.
I have ms 12b and like to mod like others...
you mean i need to add one more transformer?
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Old 13th May 2012, 06:45 PM   #50
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Default 22R 5w

Anyone know if a 22r 5w will work ok in the place of the 15r 7watt
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