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previous: Fj which OT tranny (who makes it?) is ... -- 9/15/1999 11:25 PM

Re: Tweed Deluxe OT

9/17/1999 2:57 AM
Michael Cameron	Re: Tweed Deluxe OT Frank asked: How do I go-about measuring impedences of these?...my equipment is limited to a DMM...thanx in advance Frank Frank Here is how I measure em up. Apply known voltage ac to primary and read secondary voltage. Divide the primary voltage reading by the secondary voltage reading. This gives you the turns ratio. Turns Ratio times Turns Ratio equals impedance ratio. Secondary load(speaker) 4, 8, or 16 ohms times impedance ratio equals primary impedance. You can use a filament transformer to generate your ac voltage for the test. If I have missed something, someone else is free to jump in. Michael

9/17/1999 2:57 AM

Michael Cameron

Re: Tweed Deluxe OT

Frank asked:

How do I go-about measuring impedences

of these?...my equipment is limited to a

DMM...thanx in advance Frank

Frank

Here is how I measure em up.

Apply known voltage ac to primary and read secondary voltage.

Divide the primary voltage reading by the secondary voltage reading. This gives you the turns ratio.

Turns Ratio times Turns Ratio equals impedance ratio.

Secondary load(speaker) 4, 8, or 16 ohms times impedance ratio equals primary impedance.

You can use a filament transformer to generate your ac voltage for the test.

If I have missed something, someone else is free to jump in.

Michael

Replies:

J Fletcher Well what I do is similar. I apply ... -- 9/17/1999 12:58 PM
Fj thanx MC!... -- 9/23/1999 11:40 PM