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My view :^)

Posted by Paul Joppa (P) on October 23, 2005 at 12:58:28

In Reply to: small signal transformer designs posted by mqracing on October 20, 2005 at 09:22:57:

For what it's worth ...

1) MQS-1 ... 600/250/150/62.5 to 77Kohms

Works for MC step up, for the lower output cartridges. A 47k secondary would be more universal.

2) EXP-393 ... 600 ohm primary to 600 ohm CT

Good for CD player output, if the player has a good opamp that can drive 600 ohms well.

3) MQA-6 ... 2.5, 5, 10, 15, 20, 30, 40 and 60 ohms to 60,000 ohms CT

Turns ratio is too high for most MC cartridges, and almost nobody uses a push-pull input stage with transformer input.

4) MQA-13 ... 15kSE to 60kCT

interstage\phase splitter but won't quite drive a pair of 45s or 2A3s, so limited application. Maybe powers a PP driver?

5) MQA-15 ... 20K CT to 45K CT

Use with the above phase splitter before the driver stage? How about MQA-13 - PP 5687s - MQA-15 - PP 300B - S-271-A? Very simple amp, and Mike can finally buy that Ferrari!

6) MQA-16 ... 15K single ended to 500 CT, 330, 250, 200 CT, 125 and 50

Just right for preamp and headphone output, using the classic triodes (27/76/6J5/6c4/etc). Not enough juice for pro console peaks, unless a magnetic material with greater headroom is used.

7) MQA-18 ... 20K CT to 50, 125, 200 CT, 250, 330, and 500 CT.

As above for PP outputs; does have more signal level capability

8) MQA-23

driver transformer for Class A2-AB2-B2, not a popular configuration in the last 40 years.

OK, that's my two cents. I think the MQA-16 has the most potential applications - but how does it compare with the B7-15k?

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