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Old 12th July 2013, 08:48 AM   #501
AJT is offline AJT  Philippines
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no, power traffo for a tube phono stage...
the other 3 are for a tube tone control amplifiers...
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Old 21st July 2013, 05:34 AM   #502
AJT is offline AJT  Philippines
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i bought a component tester from RBT, a local DIY'er...
and since been doing testing inductance tests on traffos...

this is primary coil only...
Click the image to open in full size.

with cores...
Click the image to open in full size.

therefore the core's mu is about 428..
notice also changes in impedance with and without core, 48.6 from 17.9 ohms..

and now to compare deeco iron with z11 irons...
deeco iron is on the left and the z11 at the right...

Click the image to open in full size.

Click the image to open in full size.

choke has about 1400 turns #30 wire on a 3/4 x 1 inch bobbin...
inductance of coils is 49.5mH
Click the image to open in full size.

deeco iron assembled and gapped showed 4.65H
Click the image to open in full size.

z11 choke gapped and assembled showed 6.96..
this shows that for a given size, you will get more inductance out of a z11/M6 cores
than an H50 or deeco core...
Click the image to open in full size.
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Old 21st July 2013, 12:07 PM   #503
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deeco core = mild steel ?
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Old 21st July 2013, 10:06 PM   #504
AJT is offline AJT  Philippines
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silicon steel, gage #24, otoh, the z11/M6 is gage #29...
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Old 23rd July 2013, 02:52 PM   #505
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Hi Tony, that's cool. I have similar tester
which core is better... the one with lower inductance or the higher one?

Click the image to open in full size.
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Old 23rd July 2013, 04:56 PM   #506
AndrewT is offline AndrewT  Scotland
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Is that telling us that the resistor has 10uH of inductance?
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Old 23rd July 2013, 09:52 PM   #507
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It might be a Bourns inductor, part number 77F100K-TR-RC: (here is a link)
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Old 23rd July 2013, 10:49 PM   #508
AJT is offline AJT  Philippines
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Quote:
Originally Posted by JOHN BALI View Post
Hi Tony, that's cool. I have similar tester
which core is better... the one with lower inductance or the higher one?
Z11/M6 gives higher inductance for the same iron dimensions...
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Old 24th July 2013, 04:43 AM   #509
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Quote:
Originally Posted by AndrewT View Post
Is that telling us that the resistor has 10uH of inductance?
no no... it's not a resistor
It is 10uH inductor, "inductor model resistor" that the seller says
Quote:
Originally Posted by transistormarkj View Post
It might be a Bourns inductor, part number 77F100K-TR-RC: (here is a link)


Quote:
Originally Posted by AJT View Post
Z11/M6 gives higher inductance for the same iron dimensions...
Thanks Tony for these measurement,
now I can start to make my own transformer
with more confidence
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Old 24th July 2013, 04:46 AM   #510
AJT is offline AJT  Philippines
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yes, john, now we can put some numbers on what we do.....
for inductors that will have dc biasing, i suspect that inductance
will be lower, at least a half of what we measure...
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