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Iron Pumpkin(s) and other smaller vegetable animals
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Old 3rd September 2017, 11:26 AM   #21
Zen Mod is offline Zen Mod  Serbia
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Iron Pumpkin(s) and other smaller vegetable animals
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Originally Posted by aspringv View Post
Hi zenmod! Looks great. And those $200 AVC's look interesting too!

With regards to the diamond buffer, what is the benefit of the current mirror over a CCS of some kind? And how did you tune it to a similar distortion structure as the jfet complementary buffer?
if you look again at buffer schematics , BD transistors are doing all work , while small JFet (MMBF5486) is working as 5mA CCS , which is , again , biasing current mirrors up and down on rails

so , there it is , you have CCS

THD spectra is result of currents and voltages involved

besides - that Diamond buffer is hardly anything new under the sun
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Old 3rd September 2017, 02:12 PM   #22
aspringv is offline aspringv  Australia
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Iron Pumpkin(s) and other smaller vegetable animals
ZM - thank you, but I should have phrased that better. Why that particular type of CCS? I see it's quite elegant to use the one jfet for two (matched!) Ccs's... Actually, I guess that's the why. :dunce:

Thank you - cheers for the explanation.

Last edited by aspringv; 3rd September 2017 at 02:14 PM. Reason: I spells good!
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Old 3rd September 2017, 03:16 PM   #23
2 picoDumbs is offline 2 picoDumbs  Australia
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Which transformers are you using?
Apparently the Cinemags that Papa also recommends are cheaper than the Jensens.
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Old 3rd September 2017, 04:19 PM   #24
needtubes is offline needtubes  United States
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Indeed, the Cinemags are cheaper. In fact, the high nickel Cinemags are cheaper than the ordinary Jensens. Only slight issue is that Cinemag builds to order, so you are looking at waiting several weeks to a couple months.
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Old 3rd September 2017, 07:14 PM   #25
Zen Mod is offline Zen Mod  Serbia
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I did write that ..... AVCs are on Hitachi Metglas cores , my own custom ones

winder is not exactly Beautiful nor Virgin ....... but he is a friend

maybe I'll open Trade thread later tonight , but all technical info is ( I think) already there

regarding Cinemags and Jensens ........ we can mention them only in context of Iron Pre , which is pretty similar but certainly enough different beast - distinctions already written about more than once

Jensens deliberately chosen for Iron Pre pcbs , by 6L6 ..... I'm not doubting his choice and reasons

I believe you will get them and JFets , as part of Store package
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Old 3rd September 2017, 09:38 PM   #26
2 picoDumbs is offline 2 picoDumbs  Australia
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Just wondering whether the board will accept other transformers.
I already have a spare pair of Jensens though, so no problem.
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Old 3rd September 2017, 09:50 PM   #27
Zen Mod is offline Zen Mod  Serbia
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yup

there are wirepads on board for regular pot (right after selector) ; cut trace between pads, include pot ;

wire any other autoformer instead of AVC

that speaking of Iron Pumpkin

speaking of Iron Pre - 6L6 is having first pcbs ; I can always edit gerbers to accommodate pinout for other autoformer
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Last edited by Zen Mod; 3rd September 2017 at 09:53 PM.
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Old 3rd September 2017, 10:53 PM   #28
2 picoDumbs is offline 2 picoDumbs  Australia
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You're bloody beautiful
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Old 3rd September 2017, 10:54 PM   #29
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YouTube

Haha
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Old 3rd September 2017, 11:04 PM   #30
Zen Mod is offline Zen Mod  Serbia
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You're bloody beautiful
I know
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