SissySIT R.3

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#81
I ordered several roughly matched THF-51S with rough data from Japan and received them with the following markings from the seller:

1. 3.3
2. 3.3
3. 2.5
4. 2.5

I decided to test them on curve tracer and the result is in attachment below (1 - 4 from left to right)

Then I whip a rough jig to test them under Vds = 24VDC and Ids = 2A, and the results of Vgs are:

1. -3.51 V
2. -3.48 V
3. -2.78 V
4. -2.73 V

I'm planning to use one pair for SissySit R.3 and the other pair for Singing Bush.

Since those 2 pairs are in different zone range, does it matter using them in any of the aforementioned amps? Or ones are better in one amp and vice versa.
 

Attachments

  • Curve Trace - THF-51S.jpg
    Curve Trace - THF-51S.jpg
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#86
From ZM
I made capital error on pcb, and really don't know how to circumvent that - after ordering Null batch of pcbs, I decided to change name of amp from SEF ( Schade Enhanced Follower) to SET (Schade Enhanced Thingie) .... and now I have set of pcbs with inappropriate name on them .......
_____________________________________________________________________________
Does that make it a TURNIP SURPRISE?
 
#87
Is the thread in the trade forum already there for the boards / kits of R.3 ?


It looks like this revision would address all the drift issues I had with my SissySIT R.1 (Iq, offset - both through variations in wall AC voltage, as well with temperature).

Even though, the SissySIT sounded absolutely great - very musical, engaging, palpable, and yet totally clear and detailed ... much more detailed than my Aleph J-ish build or my M2.

For what it's worth, I had about 0.16% THD at 1W into 8 Ohms.

Looking forward to building the R.3 😀

Best regards, Claas
 
#93
chede said:
Is the thread in the trade forum already there for the boards / kits of R.3 ?


It looks like this revision would address all the drift issues I had with my SissySIT R.1 (Iq, offset - both through variations in wall AC voltage, as well with temperature).

Even though, the SissySIT sounded absolutely great - very musical, engaging, palpable, and yet totally clear and detailed ... much more detailed than my Aleph J-ish build or my M2.

For what it's worth, I had about 0.16% THD at 1W into 8 Ohms.

Looking forward to building the R.3 😀

Best regards, Claas
Click to expand...

Same here, boards not in Group buy, so likely not finished for availability yet.
Not like I don't have plenty to finish already, 2 amps in process already...and will give time for boards to be Sussed out to perfection.

Russellc
 
#96
I'm trying not to pay attention to the other two.....I'm already buried! Having troubles with BoM parts for Aleph Zen being back ordered, having to go through boxes for things I may already have, and sizing up alternatives for those I don't.

usual business for greedy one...:wave:

Russellc
 
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