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What's wrong with the kiss, boy ?
What's wrong with the kiss, boy ?
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Old 16th July 2021, 10:31 PM   #1261
codyt is offline codyt  United States
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What's wrong with the kiss, boy ?
Such a wonderful layout!! But only two jfets in the buffer? I flipped the board over expecting to find 10-15 small buggers. Oh well, I think these two should work well enough
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Pearl II > B1v1 / B1v2 / B1K / H2v2 / BA1FE / BA3FE / WBA18 / ACP+ / Broskie-SRPP / 2SK79-SRPP / Iron Pre > F4 / F5(K1530/J201) / F6 / AJ / AJSS / ZMJ2 / SONY VFET-SE / SB77B
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Old 16th July 2021, 10:56 PM   #1262
Zen Mod is offline Zen Mod  Serbia
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What's wrong with the kiss, boy ?
you can always piggy-back more

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Old 22nd July 2021, 07:33 PM   #1263
codyt is offline codyt  United States
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What's wrong with the kiss, boy ?
Finished up my stock Iron Pre this afternoon. Sounds really nice so far! Was a breeze to build and setup. I only ever use a single source at a time, and bypassed the relay's and twister for now. As stated in a previous post, I'm using a regular old pot for attenuation to start with, and then hope to swap in the Slegle $200 autoformer pair for attenuation soon. Shooting for an Iron Pumpkin Lite, if you will

Thanks to ItsAllInMyHead for the free prototype board! I used his BOM for anything I didn't have, and it worked perfectly. I say these are definitely ready for the store.

Last but not least, thanks to ZM for the superb design, layout, and constant help. You're the best!!
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File Type: jpg IMG_1171.jpg (810.4 KB, 204 views)
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Pearl II > B1v1 / B1v2 / B1K / H2v2 / BA1FE / BA3FE / WBA18 / ACP+ / Broskie-SRPP / 2SK79-SRPP / Iron Pre > F4 / F5(K1530/J201) / F6 / AJ / AJSS / ZMJ2 / SONY VFET-SE / SB77B
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Old 22nd July 2021, 08:52 PM   #1264
BRN is offline BRN  United States
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What's wrong with the kiss, boy ?
codyt,

That is one fugly build.
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Old 22nd July 2021, 08:55 PM   #1265
codyt is offline codyt  United States
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What's wrong with the kiss, boy ?
Thanks! It was fun doing something small and easy after tackling those high stress monoblocks If I measured correctly, I should have room for the two autoformers...
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Old 23rd July 2021, 01:10 AM   #1266
codyt is offline codyt  United States
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What's wrong with the kiss, boy ?
After doing a bit of side-by-side listening with my DAC source, I'm noticing a fair amount of LF roll-off. Is that the norm for these little autoformers? I have a feeling its probably an issue with my build, but haven't spotted anything yet.
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Pearl II > B1v1 / B1v2 / B1K / H2v2 / BA1FE / BA3FE / WBA18 / ACP+ / Broskie-SRPP / 2SK79-SRPP / Iron Pre > F4 / F5(K1530/J201) / F6 / AJ / AJSS / ZMJ2 / SONY VFET-SE / SB77B
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Old 23rd July 2021, 01:14 AM   #1267
6L6 is offline 6L6  United States
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What's wrong with the kiss, boy ?
That doesn’t sound normal… There is no issues with LF performance on mine, and I have the same transformers.
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Old 23rd July 2021, 01:25 AM   #1268
Zen Mod is offline Zen Mod  Serbia
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What's wrong with the kiss, boy ?
Quote:
Originally Posted by 6L6 View Post
That doesn’t sound normal… .....
agree

and , taking in account simplicity of both concept and construction, I can't even think of any scenario what Cody ooked there?

as far as I remember Iron Pre was already made with all 3 types of xformers - Edcor, Jensen, Cinemag
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Old 23rd July 2021, 01:29 AM   #1269
codyt is offline codyt  United States
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What's wrong with the kiss, boy ?
I may need to double-check resistor values? I kinda feel like it may be an output impedance issue. I was also looking back to see if the Jensen required any clipping, bridging, etc

*Edit* Since I recovered these Jensen's from my F6 boards, also considering the fact that perhaps I boogered up a winding..
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Pearl II > B1v1 / B1v2 / B1K / H2v2 / BA1FE / BA3FE / WBA18 / ACP+ / Broskie-SRPP / 2SK79-SRPP / Iron Pre > F4 / F5(K1530/J201) / F6 / AJ / AJSS / ZMJ2 / SONY VFET-SE / SB77B

Last edited by codyt; 23rd July 2021 at 01:31 AM.
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Old 23rd July 2021, 01:31 AM   #1270
6L6 is offline 6L6  United States
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What's wrong with the kiss, boy ?
How is the power transformer wired to the PCB? Do you have any connection to the CT?

How is the PCB grounded to signal ground?

Is the photo in post #1263 the final wiring?
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