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Old 31st October 2013, 02:00 PM   #21
Michael Rothacher is offline Michael Rothacher  United States
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Ironamp Video Posted
Thanks guys!

Quote:
Originally Posted by soundhappy View Post
This is interpretation of Western Electric 25B triode amplifier ?
L'Amp versus Ironamp sound witch one is more transparent ?
Could be possible please discribe this subjective sound presentation
Yes, it's certainly an homage to the WE25B. Though I'd love to have some some more info on that one, if anyone would like to share.

They're both pretty transparent, and IMO quite special. I'm usually inclined to favor the latest project though, so I'm withholding any sort of sonic assessment for later.

@vdi_nenna
Keep at it. The guys are pointing you in the right direction. Search Youtube for Impedance + Reactance + Resistance and some good lectures will come up. And, as ZM said, continue to meditate on it until the lightning bolt strikes.
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Old 2nd November 2013, 08:13 AM   #22
generg is offline generg  Germany
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Ironamp Video Posted
Did I hear right in the video, the bias voltage for the gate varies from 15 to 24V to get the 350mA for the SIT?

Does this mean even in the same index group of the SK82 we can find such a big difference in parts?

That would correspond to my observation in Nelson's new SIT project.

Nice project, Mike! Is on my to do list.

Much SITting around, you, moss57, Juma, Nelson.....

ZM were are you? Only ch (j)ocking...
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Old 2nd November 2013, 11:00 AM   #23
Zen Mod is offline Zen Mod  Serbia
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Ironamp Video Posted
well , I drew few iterations of choke(d) and CCS loaded amps , almost universal - for anything you have in drawer ........ mosfet , shaded mosfet , SSouth , SIT , PapaSit ..... be it depletion or enhancement part

Donut series , posted somewhere here

and not mentioning some , of which some you know , not posted anywhere

for now , I tried (shortly) PapaSit in some blatant FW SIT clones , same as in choked SE

they're secure in drawer now , waiting final (both technical and visual) monoblocking

so much ideas , but not so much time

I didn't step in game in time , as Papa did ...... so still wasting time on other types of work
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Old 2nd November 2013, 12:21 PM   #24
Michael Rothacher is offline Michael Rothacher  United States
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Ironamp Video Posted
Quote:
Originally Posted by generg View Post
Does this mean even in the same index group of the SK82 we can find such a big difference in parts?
Hi Generg,

I've purposely built some wiggle room into that figure. I don't have a large sample of transistors, so I don't know where the edges really are. But certainly the range is more than a volt or two.

I really like NP's push-pull amp from BAF. That'll be my winter project, and like everyone else here, I"m anxiously waiting here in front of my screen for it to drop from the sky.
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Old 2nd November 2013, 12:49 PM   #25
Michael Rothacher is offline Michael Rothacher  United States
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Ironamp Video Posted
Naked prototype shot:
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File Type: jpg proto1.jpg (697.5 KB, 685 views)
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Old 2nd November 2013, 01:08 PM   #26
nicoch58 is offline nicoch58  Europe
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Quote:
Originally Posted by Michael Rothacher View Post

I really like NP's push-pull amp from BAF. That'll be my winter project, and like everyone else here, I"m anxiously waiting here in front of my screen for it to drop from the sky.


edit
wow look gooood!
you need some nichel at the input !

Last edited by nicoch58; 2nd November 2013 at 01:11 PM.
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Old 2nd November 2013, 01:33 PM   #27
generg is offline generg  Germany
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Ironamp Video Posted
I have measured as good as I could ten SJ28 and nine K82, so I dare to say that at 1,3A for instance the working point of Papas Push-Pull they differ around 4V.

So Mike it is really good to have some margin…..

there is one SJ28 KF instead of KE but he is not outside…….
As far as I remember the KE and KF was a pinch Off voltage and this marking seems not very important for matching for Iron AmP or the SONY AmP…..

Of course my input data I choose for the tracer are self-made without any deeper knowledge….

I am always happy to see at least a curve…..

the picture shows in red the SJ28 and in black the SK82..

So you see that it is possible to find close pairs!

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File Type: jpg P and N SITs.JPG (326.9 KB, 644 views)
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Old 2nd November 2013, 01:51 PM   #28
Michael Rothacher is offline Michael Rothacher  United States
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Ironamp Video Posted
Nice work there G! A 3-4V range for the N's would agree with what I've seen so far.

Quote:
Originally Posted by nicoch58 View Post
you need some nickel at the input !
I have some fancier ones from Lundahl and Sowter, but I haven't listened to them yet. For the published project I wanted to keep it all Edcor, and leave the tweaking fun to the experts.
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Old 2nd November 2013, 01:59 PM   #29
generg is offline generg  Germany
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Ironamp Video Posted
Edcor is so cheap and sounds so got.....!



I still must hear the F6 with 1/4W Version instead of Jensen, with the 1/2W Edcors the sound got too much k2 ..... But I have to do it more thouroughfully ....
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Old 2nd November 2013, 03:37 PM   #30
nicoch58 is offline nicoch58  Europe
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Edcor too bad that is in US.... 350ma ,for a single ended is big iron ,what price charge for that beauty ?

Michael ,like a Papa ones ,I m anxiously waiting here that you to drop from the sky the sonic assessment
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