I am trying to make a power supply for this model 90, I got a transformer out of a model 90b problem is the color on the wires is faded,I can make out 3 reds, 3 green or blue wires, 2 blacks, 1 yellow, 1 yelow red? 1 bare wire(ground) 3 brown? I have checked with a ohm meter and determined the black wires reading between 4 to 15 ohms, (Digital readout keeps jumping) should be the primary, 2 other wires read high around 400 ohms I figure they are the high voltage secondary , the other wires only read in the .4 area I figure these are the 2.5 and 5 volt windings, there are 14 wires in all , I have pluged in the transformer and slowly turned up the variac and had my vom hooked to what I thought was the secondary and the transformer humed a bit then my vom went off the scales for a moment and then the fuse blew and also the vom, which is now shorted internally , before I ruin anymore equipment is there a for sure way to know what wire is what?
or would anyone have a color code for these old transformers ?
Thanks

Elton,
Unloaded and at full line volts, the HV secondary may put out 1000VAC or more across the full winding. What VOM scale were you using? Be careful. I smoked my VOM and blew fuses in both my DMMs making similar tests. Luckily was able to repair all 3. None of my 90B schemas shows transformer color codes, but also shows 14 wires as follows; Pri 4 wires 1 com and 3 for 105, 110, 115VAC line. HV secondary 3 wires including center tap; 2.5 VAC fils 2 wires for 4 RF tubes and detector; 2.5VAC fils 3 wires including center tap for 45's only; 5VAC fils 2 wires for rectifier only. Same transformer for 25-60 cycles line. Hope this helps.

marv

:I am trying to make a power supply for this model 90, I got a transformer out of a model 90b problem is the color on the wires is faded,I can make out 3 reds, 3 green or blue wires, 2 blacks, 1 yellow, 1 yelow red? 1 bare wire(ground) 3 brown? I have checked with a ohm meter and determined the black wires reading between 4 to 15 ohms, (Digital readout keeps jumping) should be the primary, 2 other wires read high around 400 ohms I figure they are the high voltage secondary , the other wires only read in the .4 area I figure these are the 2.5 and 5 volt windings, there are 14 wires in all , I have pluged in the transformer and slowly turned up the variac and had my vom hooked to what I thought was the secondary and the transformer humed a bit then my vom went off the scales for a moment and then the fuse blew and also the vom, which is now shorted internally , before I ruin anymore equipment is there a for sure way to know what wire is what?
:or would anyone have a color code for these old transformers ?
:Thanks

Marv,
I figured it out finally, the extra taps for the primary were messing me up, also I had my VOM set on the 1000 volt scale and it still smoked it, I thought it would be high enough scale , I also had to repair my VOM, but now have all the wires marked ,now to build the chassis to house the caps,resistors and the 80 tube and the connector board that will sit on the speaker shelf.
Thanks
E.

:Elton,
:Unloaded and at full line volts, the HV secondary may put out 1000VAC or more across the full winding. What VOM scale were you using? Be careful. I smoked my VOM and blew fuses in both my DMMs making similar tests. Luckily was able to repair all 3. None of my 90B schemas shows transformer color codes, but also shows 14 wires as follows; Pri 4 wires 1 com and 3 for 105, 110, 115VAC line. HV secondary 3 wires including center tap; 2.5 VAC fils 2 wires for 4 RF tubes and detector; 2.5VAC fils 3 wires including center tap for 45's only; 5VAC fils 2 wires for rectifier only. Same transformer for 25-60 cycles line. Hope this helps.
:
:marv
:
::I am trying to make a power supply for this model 90, I got a transformer out of a model 90b problem is the color on the wires is faded,I can make out 3 reds, 3 green or blue wires, 2 blacks, 1 yellow, 1 yelow red? 1 bare wire(ground) 3 brown? I have checked with a ohm meter and determined the black wires reading between 4 to 15 ohms, (Digital readout keeps jumping) should be the primary, 2 other wires read high around 400 ohms I figure they are the high voltage secondary , the other wires only read in the .4 area I figure these are the 2.5 and 5 volt windings, there are 14 wires in all , I have pluged in the transformer and slowly turned up the variac and had my vom hooked to what I thought was the secondary and the transformer humed a bit then my vom went off the scales for a moment and then the fuse blew and also the vom, which is now shorted internally , before I ruin anymore equipment is there a for sure way to know what wire is what?
::or would anyone have a color code for these old transformers ?
::Thanks