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Old 26th January 2013, 12:56 PM   #21
iko is offline iko  Canada
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Quote:
Originally Posted by regal View Post
I got out my quad of 4P1L's, boy they are odd looking tubes. Trying to find a western equivalent, spec wise I think they are sort of a cousin of the 306A/307A ?
Look closer, they aren't very similar to the 307a. The 307a gives better results in the output stage, AFAIC. But then, the 307a beats the 300b, so...
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Old 26th January 2013, 02:19 PM   #22
iko is offline iko  Canada
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BTW, I have ONE piece of 306A. Only one.

But I'm hopeful that 4P1L will make a great tube for the headphone amp.
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Old 26th January 2013, 06:49 PM   #23
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I got out my quad of 4P1L's, boy they are odd looking tubes. Trying to find a western equivalent, spec wise I think they are sort of a cousin of the 306A/307A ?
No Western equivalents. They were designed by Telefunken for German military. After WW-II repackaged for Soviet military purposes. The majority of special Telefunken military tubes was repackaged in loctal envelopes, except LS-50 that was too big for that.

Soviet 4П1Л = Telefunken 2,4LS1 in Loctal envelope.
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Old 27th January 2013, 02:08 PM   #24
regal is offline regal  United States
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I received a couple quotes for single-feed 5k:40 output transformers.

For a pair made by the brits its a bit over $400, with guarantee to design for lowest secondary dcr/inductance M6.

For pair made in sin city its about half that price but not guarantee on high dcr, probably M19.

Then there are china elcheapos called BEZ's that are 4k: 32-64-100-200 for only $100 shipped.

No response from the parafeed experts Magnequest, so rule that one out. Cinemag has some interesting mic ouput transformers that could be good for parafeed, but probably too small for orthos's power.

So its either britain, LV-USA, or China. Have no idea which direction to take.
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Old 27th January 2013, 03:28 PM   #25
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Have you asked Lundhal and Bartolucci?

Brits are Sowter, right?

Last edited by merlin el mago; 27th January 2013 at 03:32 PM.
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Old 27th January 2013, 04:54 PM   #26
regal is offline regal  United States
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Originally Posted by merlin el mago View Post
Have you asked Lundhal and Bartolucci?

Brits are Sowter, right?
yes Brits are sowter. I don't see anything in th lundhal catalog that would work and understand that they have a long lead time for custom stuff.
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Old 27th January 2013, 04:56 PM   #27
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If you want can I ask Giuseppe Bartolucci a quote for single-feed 5k:40 output transformers?
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Old 27th January 2013, 04:58 PM   #28
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Hi everyone...
A bit off-topic but for those of you using the SSHV regulators, what op-amp are you using in the regulator? I understand that some of the high end op-amps that can be used cause oscillation in the SSHV circuit.
One more thing... Wouldnt permalloy cored transformers be better for use as a headphone amp as they are much more sensitive magnetically? Like the UTC LS or HA series of transformers?
Thanks for your time... Daniel

Last edited by danFrank; 27th January 2013 at 05:01 PM.
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Old 27th January 2013, 05:12 PM   #29
vgeorge is offline vgeorge  Greece
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Hi everyone...
A bit off-topic but for those of you using the SSHV regulators, what op-amp are you using in the regulator? I understand that some of the high end op-amps that can be used cause oscillation in the SSHV circuit.
There are no opamps in the SSHV2. Better ask more questions to the appropriate thread, you will get more response there.
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Old 27th January 2013, 05:13 PM   #30
Stixx is offline Stixx  Germany
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Quote:
what op-amp are you using in the regulator?
There is no op-amp in SSHV regulators... the beauty of them is the simplicity (it is even part of the name ) and the sonic character of course.


vgeorge beat me to it
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