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Old 24th July 2012, 01:47 AM   #81
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Nelson is the Pied Piper and we are all drifting toward the ocean, blissfully listening to music.
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Old 24th July 2012, 01:59 AM   #82
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I C says the blind man,lol, should be interesting we got all three here R C L ,lol.
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Old 24th July 2012, 02:08 AM   #83
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Dosent the transformer provide the gain function? Then it aint 600:600???
I have a couple LL7905 (4x150 Primaries) to be driven by a B1 type circuit. The output will be the two secondaries on a BA-2/F4 output stage. Gain should be 5.6 or something. These Xfrm'rs are not inexpensive. There is no garuntee I will get the bandwidth I need but... And no garuntee they will sound good but... I'm gonna play around. Might get good midrange performance.
Genreg has suggested some lesser expensive units that he liked. And Nelson has said he got good results with some units that you might not expect good results from.
You probably want to make sure the levels you need are capable with the mic transformer.
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Old 24th July 2012, 02:11 AM   #84
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I don't think it has to provide gain. Probably depends what you're trying to achieve with it.
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Old 24th July 2012, 02:12 AM   #85
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Quote:
Originally Posted by flg View Post
Dosent the transformer provide the gain function? Then it aint 600:600???
I don't think so. I think it just splits the phase of the input signal. Plh with transformer. Just guessing as I know nothing about trafos. Wait a second. THe phase splitter does provide some gain in the PLH.
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Old 24th July 2012, 02:12 AM   #86
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Hi Flg,
A good point but also the gain on the output has 2 fets on the output,wouldn't those increase gain ? Interesting isn't it
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Old 24th July 2012, 02:15 AM   #87
labjr is offline labjr  United States
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Transformers have various functions. Good phase splitters, isolation, impedence matching, step-up/down.
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Old 24th July 2012, 03:07 AM   #88
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Quote:
Originally Posted by buzzforb View Post
I don't think so. I think it just splits the phase of the input signal. Plh with transformer. Just guessing as I know nothing about trafos. Wait a second. THe phase splitter does provide some gain in the PLH.
One of the charms about the transformer vs JLH/PLH phase splitter is that
it delivers pure symmetry in the same way a circlotron does - each like
polarity part is subjected to the same conditions, although in opposite
phase.

It is possible to do this with a phase splitter ala JLH/PLH, but if you look
carefully you will see that the bottom output device is run Common-Source
mode and the top device is Common-Drain. It is a rare circuit that will
deliver real symmetry under these conditions.

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Old 24th July 2012, 03:58 AM   #89
lhquam is offline lhquam  United States
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Quote:
Originally Posted by Nelson Pass View Post
One of the charms about the transformer vs JLH/PLH phase splitter is that
it delivers pure symmetry in the same way a circlotron does - each like
polarity part is subjected to the same conditions, although in opposite
phase.

It is possible to do this with a phase splitter ala JLH/PLH, but if you look
carefully you will see that the bottom output device is run Common-Source
mode and the top device is Common-Drain. It is a rare circuit that will
deliver real symmetry under these conditions.

Yup. The question is whether a transformer can do better than swinging around the power supplies in the circlotron. My bet is that it can.
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Old 24th July 2012, 05:01 AM   #90
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Quote:
Originally Posted by buzzforb View Post
I don't think so. I think it just splits the phase of the input signal. Plh with transformer. Just guessing as I know nothing about trafos. Wait a second. THe phase splitter does provide some gain in the PLH.
My understanding of the JLH, is the phase splitter provides gain to the common drain output (top) and no gain to the common source device (bottom) which provides it's own gain. So theoretically it should be possible to construct it so that the gain going to the source follower output is equal to the gain that the common source output provides by itself. Assuming that is what you wanted to achieve

Last edited by Melon Head; 24th July 2012 at 05:08 AM.
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