Mo Metal

[CJ]

just flip the leads on a standard innerstage transformer.

the wayback machine did not take many bot shots of vacuumbrain.  com,

not much to the neve output, just 625EI lams in regular pwr trans iron,

the original had  a reverse winding, but this did not seem to make much difference in the response,


Sowter had the slightly bigger stack if i remember correctly, so a slight shift to the bottom end,

 

[Marcedona]

OK, I did the inductance test on the Marinair LO1166A.
It read 1.8 henries before saturation and 2.1 henries after. Same effect as the Sowter, but not as dramatic a henry change. Maybe because it is more broken in and therefore more stable.

Then I put the Sowter in the enviromental chamber.

At 70 degrees F the Sowter read 2.5 henries.
At 109 degrees F the inductance went up to 2.8 henries.
So a little change, but not as dramatic as before and after saturation.

I will ask Brian to see if he knows what's uhh, the deal. (Obscure Pink Floyd song)

.

Interesting! so the heat-induced expansion of the material seems to adjust the lams-wire, and the inductance rises.. I can see myself lighting fire under my preamps.

 

[gyraf]

A(l) value is very dependent on temperature - even more so in the ferrites..

/Jakob E.