Plethora of Pinjatas / SET P amp(s)

[Zen Mod]

same SL OS both

M25 - SE input only, autoformer based FE, No NFB, gain either 4 (Cinemag, Jensen classic repeaters) or 6 (Edcor 600:15K), mild THD, dominant 2nd neg

PoP - active FE, both SE and Bal input, NFB yes, gain - forgot ........ aha - 100K/10K, loow THD, dominant 2nd neg

sound - all my amps are sounding the same

 

[Russellc]

Well, I'm thinking of one or other, Lord knows I need another.

Russellc

 

[viltsone]

What other output Mosfets can be used in this schematic? TTC5200/TTA1943? FQA40N25/FQA36P15? Or something better?

How to get these pcb-s and matched 2SK2145BL ?

 

[Zen Mod]

other OS parts - they will work, but with slight difference, if there is a difference in xconductance, comparing to originally used

slight - no night and day

though, clever to use mosfets in output, as is constructed ........... TTC/TTA are bipolars

availability - you're practically just one personal message away of knowing how

 

[Russellc]

Now, he is in for it! I see him getting many packs from behind Iron Curtain!

 

[shattered_dream]

Which case you recommend for XA252 PoP?

 

[Zen Mod]

4U/400 Modu is natural one for all my small amps

don't forget - they all are sounding the same ........ that's why same adequate case

 

[schultzsch]

A close friend of mine liked the Mini so much that he wanted one too.
I hope he will like the outcome 😎

 

[Zen Mod]

matter of principle - if sending wires though metal plate, always do it in "natural pair through one hole" fashion, using grommets

example: [L & N] wire through same grommet-ed hole

example 2: [+, GND, -] through same grommet-ed hole

btw. which amp is that?

if PoP, I'm glad seeing someone else's pcbs

I'm famous!!

 

[schultzsch]

Yes, it is the PoP.. I call it Mini 🙂

 

[Zen Mod]

 

[Russellc]

So far so good, hopefully. Here's boards, no ccs board yet, but thought I would post for more eyes to find my ook ups. Did I leave anything out?

This is standard P of P, not set version.....

TIA,

Russellc

 

[Zen Mod]

looking good

 

[Russellc]

On initial fireup, does this follow XA 252 method, both neg and pos inputs grounded, grounding jacks in amp input. Solder blob across
S101 and S201, Jumper in place? Oh, this is straight mosfet version, NOT SET.

Russellc

 

[Zen Mod]

yup for everything

I believe you got separate sch files in fileset I sent you, so just strictly follow one for straight MOS

I mean, I don't remember, but it's logical that I did

for start, while setting Iq, no jumper across cap in negative input leg, only later

 

[Russellc]

Oh, I remembered it backwards. So, no close of JP101 and JP201 at fireup, closed once done.

Is this also like XA 252 that no power down required for closing JP 101 and JP 202?

Thanks,

Russellc

 

[Russellc]

Checking file set, only notes are what parts to exclude, short S101 and what resistor to use in another position. Dont see any other notes, although
I do see two additional tabs on that note file, unfortunately they had nothing in them. I went through the other files, I could just be too dense to locate, but seems logical they would be in the "notes" part.


Russellc

 

[Zen Mod]

did you soldered small CCS daughterboard pcbs on big pcb?

 

[Zen Mod]

Note:

Plethora of Pinjatas, DO NOT MOUNT:

DO NOT MOUNT ZD103, R142, M101, R144, R149, Q109, R143, R145, R146, T108

R147=100R

SHORT S101


Plethora of Pinjatas_SET: MOUNT all of above

R147=750R

OPEN S101

 

[Russellc]

did you soldered small CCS daughterboard pcbs on big pcb?

Yes. Let me post pic.