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Old 18th December 2011, 12:40 PM   #151
AndrewT is offline AndrewT  Scotland
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How low does the VAC-VAC pressure have to go to be effective?
1/2 atmosphere absolute, or 1/4 atmosphere absolute, or much lower?
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Old 18th December 2011, 01:12 PM   #152
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Depends on several factors:
- viscosity of impregnating fluid;
- coil properties (not neatly wound non-interleaved or neatly wound interleaved);
- time.
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Old 20th December 2011, 11:04 AM   #153
AJT is offline AJT  Philippines
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traffo for push-pull 6V6 power amp:

core size is 1 1/4 x 2 1/8, turns per volt is 2.84

starting the primary coil:
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finished winding rpimary:
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starting the secondary coil:
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starting the rectifier fimament winding:
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bias and 6.3volt filament winding:
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leads terminated and final outer wrap done:
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putting in the laminates:
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completed traffo:
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after dipping in varnish, traffo is placed under sunshine for curing:
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Old 21st December 2011, 07:50 AM   #154
sekhar is offline sekhar  India
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@ TONY
beautifully done .................. Just have to say ur too good at making these transformers.....
Keep up ur good work.....

regards
sekhar
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Old 22nd December 2011, 09:06 AM   #155
AJT is offline AJT  Philippines
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^Thanks.......i have been doing this for the last 30 years......
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Old 22nd December 2011, 09:16 AM   #156
Grega is offline Grega  Australia
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tony - thats beautiful mate - this is something else i want to learn as well.

where did you get your winding device or is it something that you made (or inherited if you've been doing this for a few years)
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Old 22nd December 2011, 09:35 AM   #157
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Quote:
Originally Posted by Tony View Post
^Thanks.......i have been doing this for the last 30 years......
Hi Tony,
that a long time, I'm not 30 years old yet
You really an expert...
please share your experience to beginner like me

I don't see any "inter layer" insulator on this trafo...
Maybe for small trafo it is no need that inter layer insulating?
Then start on how much VA ratting we need to put the inter layer insulator?
Please guide me

Thanks
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Last edited by JOHN BALI; 22nd December 2011 at 09:43 AM.
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Old 22nd December 2011, 09:36 AM   #158
AJT is offline AJT  Philippines
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hi, that winding machine is an old china job using analog dial counter, i've had it for years...
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Old 22nd December 2011, 09:46 AM   #159
AJT is offline AJT  Philippines
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Quote:
Originally Posted by JOHN BALI View Post
Hi Tony,
that a long time, I'm not 30 years old yet

I don't see any "inter layer" insulator on this trafo...
Maybe for small trafo it is no need that inter layer insulating?
Then start on how much VA ratting we need to put the inter layer insulator?
Please guide me

Thanks
inter-layer insulation's are mandatory......regardless of power levels....

i used inter-layer insulation, clear cellophane tapes, in several layers, and pvc plastics cut to size......

i used a dual chamber nylon bobbin, the primary and secondaries are well separated....
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Old 22nd December 2011, 10:12 AM   #160
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Quote:
Originally Posted by Tony View Post
inter-layer insulation's are mandatory......regardless of power levels....

i used inter-layer insulation, clear cellophane tapes, in several layers, and pvc plastics cut to size......
Oh, i don't see it because it is clear
I clear now ...
you inspire me

Thanks
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