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I have a very old side mic 148 that appears to be in need of a final. I dont have a replacement 1969, but I have a few old 2312's. Can I just do a straight swap? If so, should the final bias be set to 50 mA like the stock 1969?

Thanks.

Yes it will work as a straight up swap. And ... yes set the bias to 50ma like the stocker.

- 399

yes and the 1307 will swap too

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QTH: Vert 160/80, Fan 40/20/10, Fan 17/15/12/6, 2m J pole, 2m halos Mobile: 12/15/17/20/40, 10, 6, 2/440

a 1307 or a 477 will do also...73 de JW

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FT450d,TS520,RCI2950dx and 2980wx,seven Siltronix 1011d,FT250r ht,motorola maxtrac300 uhf SWAN1200x

A word Caution
You can replace a 1969/2312/1307 with a MRF 477, BUT the Base/Emitter/Collector pin out is not the same.
Pins # 2 & 3 must be crossed, and insulated with a small pc of heat shrink to prevent them from shorting.
1306/1307 driver/finals are rare as hen`s teeth to find nowadays, they have not been made for a very long time.


73
Jeff

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there is no dark side in the moon, really. As a matter of fact it's all dark

the do need crossed...been so long since i fooled with trans...i like glass,tubes...73 de jw

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FT450d,TS520,RCI2950dx and 2980wx,seven Siltronix 1011d,FT250r ht,motorola maxtrac300 uhf SWAN1200x

Thank you all!

DE NADA.