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In Reply to: RE: dynaclone and triode not offering transformers posted by Paul Joppa on September 06, 2021 at 18:21:51
I've measured most of the Dynaco transformers with a Wayne-Kerr impedance analyzer- impedance varies with secondary used, I used 8 Ohms. At 1 KHz:
A410: 9400
A420: 7200
A430: 4700
A470: 5150
Z565: 8300
Z565-48 Clone: 8250
These include winding resistance as they're measured loaded. All will be lower if measured by voltage ratio (unloaded).
Follow Ups:
I have a pair of "A470"s, bought from Triode more than 20 years ago; I just now measured the turns ratios and got:
4 ohm tap: 4190 ohms anode-anode
8 ohm tap: 4676 --- " ---
16 ohm tap: 4306 --- " ---
Primary end-end DC resistance about 200 ohms, so a reasonable guess is to add 400 ohms for a loaded transformer (the secondary DCR is more difficult to measure so I didn't). That gives 5076 ohms on the 8-ohm tap, consistent with your 5150 measurement.
So it looks like the 4300 ohm spec is for the turns ratio, not the actual tube load impedance. And the 8 ohm tap is slightly different from the others.
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