DX-100 audio

[W3SLK]

Welp, it looks like the driver transformer in the DX-100 crapped out. I checked my parts rig and it has a nice little void where the transformer was. What I would like to know is I have a Thordarson 20A18 interstage transformer designed for a single end driving push pull grids. Pri is 10Kohms/Sec 90Kohms with a 1:3 ratio. Would this transformer work in lieu of the OEM that bit the dust? The only thing I can garner about it is that it is a 2:1 Pri-1/2Sec and that is what comes off of the schematic. No other data such as its impedances are available. Many thanks for any help.

[WA5VGO]

I was under the impression that the DX-100 drove the 1625's into grid current. If this is the case, what you really need is a driver transformer(step down), rather than an interstage(step up) transformer.

73,
Darrell, WA5VGO

[W3SLK]

Thanks, Mark. I forget that Peter Dahl's listing can be used as a resource too. I just found a Merit A-2921 that has a 1.7:1 Pri-1/2 Sec. It is listed as a driver transformer without any impedances. I wonder if this will be close enough without much degradation in the audio.

[WA5VGO]

Assuming that the primary current rating is adequate, it should be okay.

73,
Darrell, WA5VGO

[W3SLK]

Darrell said:

Assuming that the primary current rating is adequate, it should be okay.

The primary is listed at 35mA. That should give me some headroom. TNX