300B OT nano, first test

[merlin el mago]

Walter could I ask who is making for you the custom transformers or are diy by yourself?

 

[waltube]

Walter could I ask who is making for you the custom transformers or are diy by yourself?

I am working with a little lab in Roma , now the trafos are in the final tests.
We found a good supplier for iron and box.
The intention is to put in catalog in next future.
With power trafo, C nucleos or EI
At the moment are four /five different types, only Nano
And one for MC cart. in mu metal


Walter

 

[waltube]

These last tests on s.e. 3.500 ohm / 5 ohm, final.
20 w nominal
Same nucleus of p-p
Nano.

Around 40H
Rdc primary = 76 ohm

Backward test
Response, two trafos, 5 watt on 750 ohm

Phase

 

[50AE]

Never had any intention of being so impolite, as I have never used the A-word toward anyone on this site. If it seems that I implied such a response, then I apologize; that was never my intention.

Thank you for being clear about your intentions and I too apologize for my harsh attitude.
To clarify, 100 milliohms for a secondary is a completely normal value.
A classic situation of a pseudo-short is to have a secondary layer with less or more turns than intended. When paralleled, the different turn count layer will act as if there's a short. Measuring this requires comparing the inductance value with all secondary layers disconnected and connected. If there's a difference within the inductance value, if it is lower when secondaries are paralleled, then one or more layers are different in turn count.

 

[waltube]

Last news.
One additional proto arrived
5k+5k : 5k+5k
Nano
always with E810F with 20 mA of Ia
Freq response 10k:10k
40 Vout on 10 kohm load