Does anyone have any information on a #9100-0082 transformer?
I am looking for ratings and wire code.
It has a pair of green 6.3 volts?
a pair of gray
a pair of brown
a pair of yellow 5volts?
a pair of red with a red/yellow which has to be HV
a blk, blk/yellow, blk/red, blk green
I am looking for ratings and wire code.
It has a pair of green 6.3 volts?
a pair of gray
a pair of brown
a pair of yellow 5volts?
a pair of red with a red/yellow which has to be HV
a blk, blk/yellow, blk/red, blk green
Attachments
I've found the information in this thread to be useful when attempting to identify mystery power transformers:
http://www.diytube.com/phpBB2/viewtopic.php?t=1465
http://www.diytube.com/phpBB2/viewtopic.php?t=1465
Ok my secondaries measure 21.6 ohms each or 43.2 across.
The secondary output is 830 with no load.
Would this give me about 400 volts out at about 275mA with cap input and 380mA with choke input?
The secondary output is 830 with no load.
Would this give me about 400 volts out at about 275mA with cap input and 380mA with choke input?
I would estimate current ratings of about 250 mA cap / 350 mA choke from your resistance readings.
Download the free PSU designer program from duncanamps.com to estimate the output voltage with your rectifier of choice.
Download the free PSU designer program from duncanamps.com to estimate the output voltage with your rectifier of choice.
burnedfingers said:
I took a look through my old HP manuals and found the instrument your transformer was used in. It's from the type 738B AC/DC calibrator. This was essentially a well regulated DC supply with a 400~ oscillator and a power amplifier that used a pair of 6550s in PP with up to 300 volts output. It's a nice transformer. But I think the estimate of 350mA w/choke input is too much. Also, the unregulated DC out was 440V and was on the 6550 plates.
Tube compliment:
2) 6550
1) 12AU7
4) 12AX7
1) 6BA6
1) 6CL6
1) 6AU6
1) 6AV5GA
1) 5U4GB
1) 5651A
a pair of green...............6.3V for 2/6550, 12AU7, 12AX7, 6BA6
a pair of gray.................6.3V for 6AU6, 6CL6, 12AX7
a pair of brown...............6.3V for 6AV5GA, 2/12AX7 (regulator/elevated)
a pair of yellow 5volts?....yes
a pair of red with a red/yellow which has to be HV...yes
a blk, blk/yellow.............115V
blk/red, blk green...........115V
blk+blk/red....................230V (blk/yel & blk/grn tied together)
Attachments
Thanks for the info.
Do you think I can use it for a Dynaco clone project?
I'm missing the bias winding so can I use a voltage divider off one leg of the AC then rectify it to come up with my B- and then go to my bias pots?
Do you think I can use it for a Dynaco clone project?
I'm missing the bias winding so can I use a voltage divider off one leg of the AC then rectify it to come up with my B- and then go to my bias pots?
The voltage regulator is quite an interesting design as well, better than my long ago efforts using differential error amplifiers in that it should have a lot more open loop gain. I'm inclined to investigate further.. Thanks to HollowState for posting the schematic...
Any ideas as to how much amperage the green 6.3 winding might be capable of? Any way to check this? The leads are thick gauge solid wire.
Quote:
The secondary output is 830 with no load.
Actually upon rechecking this and finding that I didn't get the same reading I changed the batteries in my meter and came up with 870 AC no load and 597VDC on the output of a 5U4 and a 16mfd/600 volt cap. Wouldn't this push the capabilities of this transformer up a little more?
Quote:
The secondary output is 830 with no load.
Actually upon rechecking this and finding that I didn't get the same reading I changed the batteries in my meter and came up with 870 AC no load and 597VDC on the output of a 5U4 and a 16mfd/600 volt cap. Wouldn't this push the capabilities of this transformer up a little more?
If the heater leads are solid, they're probably extensions of the winding. Some typical capacities at 500 circular mils/amp:
18 ga: 3.2A
16 ga: 5.2A
14 ga: 8.2A
18 ga: 3.2A
16 ga: 5.2A
14 ga: 8.2A
0.063 would be closest to 14 gauge.
http://en.wikipedia.org/wiki/American_wire_gauge
My reference suggests 700 circular mils per amp. That would say that 14 gauge is good for 5.9 amps. Clearly there is some latitude, as Tom's sources are more generous. I think the way to know for sure is to load up the winding, and verify the voltage drop under load is "acceptable".
http://en.wikipedia.org/wiki/American_wire_gauge
My reference suggests 700 circular mils per amp. That would say that 14 gauge is good for 5.9 amps. Clearly there is some latitude, as Tom's sources are more generous. I think the way to know for sure is to load up the winding, and verify the voltage drop under load is "acceptable".
Update if anyone is interested
I used the transformer in my "Spare Parts Dynaco" amplifier that I built. It seems to work fine and will run for hours and still run cooler than the stock transformer does. The only glitch was it didn't have a bias tap and this problem was solved in another thread.
I used the transformer in my "Spare Parts Dynaco" amplifier that I built. It seems to work fine and will run for hours and still run cooler than the stock transformer does. The only glitch was it didn't have a bias tap and this problem was solved in another thread.
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