UGS-muse preamp GB

[Oneminde]

No problem - The simplest solution is to offer the std UGS4 only since it is 100% match to the original and the X version might be offered later when confirmed and if there are any interests.

 

[Pars]

Hello,
Unfortunately not as I reused the boards here that were designed by Flat for the UGS all inclusive (the full relay version) and this was single primary wiring only.
But those pcb are not difficult to modify, I remember to do exactly what you want to do, with a dual primary transformer by drilling few additional holes on the pcb to accommodate the additional transformer pins.
Or maybe someone can redesign those PCB, they are super simple, single layer, with kicad I guess half day max work but sorry I don’t have time myself to do it.
Thanks for HCFR, yes this is a good forum too
Alex.

Thanks Alex, that is what I thought but wanted to make sure. Not reading or speaking French, I am slowly going thru the thread on homecinema.fr now, but hadn't seen anything to lead me to believe otherwise. There wasn't a board layout for the external supply on the 1st post so I couldn't tell whether it had been updated or not.

 

[fencki]

It has to be a yes for a complete UGS-Muses (all boards) + UGS4 and/or the UGS4x + adapter board.

J109/k389 are just dual J74/K170. I believe the 2SK209GR (Idss; 2.6~6.5 mA) or 2SK209BL (Idss; 6.0~14 mA) is a good substitute. They are roughly €0,35/pcs if one order more than 10 pcs.

2sk209gr are available but what’s with the 2sk209bl?
would the gr type be „enough“?

 

[Oneminde]

PASS typically use an Idss of 6-8mA as far as I know. So depending on the lower or higher mA target dictates the grade you will end up with - for the TO92 package, we will use the std J74/k170-BLgrade

 

[fencki]

one additional question:
will there be all the pcb‘s available in the kit? with all the small ones on the back too?
and ugs pcb‘s from the former GB? external PSU pcb‘s?

thx

 

[lapoulpe]

Hello Alex
I am also a taker, below the updated list.
cordially


Updated:

Twitchie : 1-2 PCB sets + gain stage (if offered)
Guyisme : 3 MCU + L/R PCB
Gionag : 1 PCB set ?
Fencki : 1 PCB set + gain stage (if offered)
Mensing : 1 PCB set
Itsallinmyhead : 1 PCB set + gain stage (if offered)?
Kk74 : 1 PCB set
Fabian85 : 1 PCB set ?
Eriksson : 1 PCB set ?
Myl : 1 PCB set + 2 gain stages ( if offered )
Ernesternest : 1 PCB set
Norgaard : 1 PCB set + 2 gain stages ( if offered )
Dennis Hui : 1 PCB set
Astromo : 1 PCB set ?
Oneminde : 1 PCB set + gain stage (if offered)
Stanney2017 : 1 PCB set.
Stones : 1 PCB set
schultzsch : 1 PCB set
HelmutHolz: 1 PCB set + gain stage (if offered)
trung224: 1 PCB set
Awh: 1 pcb set
Adams_Leo: 1 PCB set
JoeyDD: 2 PCB sets
Axelcs : 1 PCB set
Emyeuoi : 1 PCB set + gain stage (if offered)
Briangasberg : 1 PCB set + gain stage (if offered)
Jacek_k_wawa : 1 PCB set + gain stage (if offered)
Naz : 1 PCB set
vannhoem: 1-2 PCB set +gain stage (if offered)
Hicoco 1 PCB set
unixdeveloper : 1 PCB set + gain stage (if offered)?
lancer: 1 PCB set + gain stage (if offered)
lapoulpe: 2 (PCB set + gain stage)

 

[lapoulpe]

Hello Alex
I am also a taker, below the updated list.
cordially

Updated:

Twitchie : 1-2 PCB sets + gain stage (if offered)
Guyisme : 3 MCU + L/R PCB
Gionag : 1 PCB set ?
Fencki : 1 PCB set + gain stage (if offered)
Mensing : 1 PCB set
Itsallinmyhead : 1 PCB set + gain stage (if offered)?
Kk74 : 1 PCB set
Fabian85 : 1 PCB set ?
Eriksson : 1 PCB set ?
Myl : 1 PCB set + 2 gain stages ( if offered )
Ernesternest : 1 PCB set
Norgaard : 1 PCB set + 2 gain stages ( if offered )
Dennis Hui : 1 PCB set
Astromo : 1 PCB set ?
Oneminde : 1 PCB set + gain stage (if offered)
Stanney2017 : 1 PCB set.
Stones : 1 PCB set
schultzsch : 1 PCB set
HelmutHolz: 1 PCB set + gain stage (if offered)
trung224: 1 PCB set
Awh: 1 pcb set
Adams_Leo: 1 PCB set
JoeyDD: 2 PCB sets
Axelcs : 1 PCB set
Emyeuoi : 1 PCB set + gain stage (if offered)
Briangasberg : 1 PCB set + gain stage (if offered)
Jacek_k_wawa : 1 PCB set + gain stage (if offered)
Naz : 1 PCB set
vannhoem: 1-2 PCB set +gain stage (if offered)
Hicoco 1 PCB set
unixdeveloper : 1 PCB set + gain stage (if offered)?
lancer: 1 PCB set + gain stage (if offered)
lapoulpe: 2 (PCB set + gain stage)

 

[Ine]

The adapter board comes via Ine and I guess its only fair that he has a say about that part. He did mention that he is working on a new version for the output capacitors - so unless he is against sharing the adapter board with the rest of us, things are looking kinda decent.

Yes, for sure I have a say about that ! My adapter board is not meant for the UGS 4. Oneminde have to send me a ready assembled UGS 4 module for testing first.

I would recommend to all new builders to go for the original UGS. We all know that module it is working quite well.

 

[redjr]

Updated:

Twitchie : 1-2 PCB sets + gain stage (if offered)
Guyisme : 3 MCU + L/R PCB
Gionag : 1 PCB set ?
Fencki : 1 PCB set + gain stage (if offered)
Mensing : 1 PCB set
Itsallinmyhead : 1 PCB set + gain stage (if offered)?
Kk74 : 1 PCB set
Fabian85 : 1 PCB set ?
Eriksson : 1 PCB set ?
Myl : 1 PCB set + 2 gain stages ( if offered )
Ernesternest : 1 PCB set
Norgaard : 1 PCB set + 2 gain stages ( if offered )
Dennis Hui : 1 PCB set
Astromo : 1 PCB set ?
Oneminde : 1 PCB set + gain stage (if offered)
Stanney2017 : 1 PCB set.
Stones : 1 PCB set
schultzsch : 1 PCB set
HelmutHolz: 1 PCB set + gain stage (if offered)
trung224: 1 PCB set
Awh: 1 pcb set
Adams_Leo: 1 PCB set
JoeyDD: 2 PCB sets
Axelcs : 1 PCB set
Emyeuoi : 1 PCB set + gain stage (if offered)
Briangasberg : 1 PCB set + gain stage (if offered)
Jacek_k_wawa : 1 PCB set + gain stage (if offered)
Naz : 1 PCB set
vannhoem: 1-2 PCB set +gain stage (if offered)
Hicoco 1 PCB set
unixdeveloper : 1 PCB set + gain stage (if offered)?
lancer: 1 PCB set + gain stage (if offered)
lapoulpe: 2 (PCB set + gain stage)
redjr: 1 PCB set + gain stage (if offered)

 

[Oneminde]

@ Ine: Sounds fair. Lets do that. We are back at the original UGS gain stage and we can look at a UGS4 situation further down the road and use this thread to inform about any progress.

 

[Oneminde]

Updated - the UGS4 is removed as an option for the time being.

Twitchie : 1-2 PCB sets
Guyisme : 3 MCU + L/R PCB
Gionag : 1 PCB set ?
Fencki : 1 PCB set
Mensing : 1 PCB set
Itsallinmyhead : 1 PCB set
Kk74 : 1 PCB set
Fabian85 : 1 PCB set ?
Eriksson : 1 PCB set ?
Myl : 1 PCB set
Ernesternest : 1 PCB set
Norgaard : 1 PCB set
Dennis Hui : 1 PCB set
Astromo : 1 PCB set ?
Oneminde : 1 PCB set
Stanney2017 : 1 PCB set.
Stones : 1 PCB set
schultzsch : 1 PCB set
HelmutHolz: 1 PCB set
trung224: 1 PCB set
Awh: 1 pcb set
Adams_Leo: 1 PCB set
JoeyDD: 2 PCB sets
Axelcs : 1 PCB set
Emyeuoi : 1 PCB set
Briangasberg : 1 PCB set
Jacek_k_wawa : 1 PCB set
Naz : 1 PCB set
vannhoem: 1-2 PCB set
Hicoco 1 PCB set
unixdeveloper : 1 PCB set
lancer: 1 PCB set
lapoulpe: 2 PCB set
redjr: 1 PCB set

 

[Awh]

Are the grade B matched quad J74/K170 in the store OK for this project?

Andy

 

[Alex_twn]

Unfortunately not because the UGS3 used only implements 2SK389 / 2SJ109.

 

[Alex_twn]

2sk209gr are available but what’s with the 2sk209bl?
would the gr type be „enough“?

BL grade is preferred.

 

[Alex_twn]

one additional question:
will there be all the pcb‘s available in the kit? with all the small ones on the back too?
and ugs pcb‘s from the former GB? external PSU pcb‘s?

thx

Yes all the PCB included. Please look at HCFR thread to see the details. First page. In French but first page links are self explanatory.

 

[Oneminde]

2SK389 / 2SJ109 are dual J74/K170 so should be fairly simple to modify the pcb to accept single SJ74 / K170's ?

 

[vannhoem]

Unfortunately not because the UGS3 used only implements 2SK389 / 2SJ109.

I see the BOM at <<UGS - Muse edition>> - 30058092 - sur le forum <<Amplis et Preamplis>> - 1056 - du site Homecinema-fr.com, 2SK389 / 2SJ109 can be replaced by sk170bl/sj74bl. Is it acceptable and any adjustment for that?

 

[Alex_twn]

Probably but I won't do it . I let you redesign an UGS3 or 4 with the matched j74/k170.

 

[Alex_twn]

@ Ine: Sounds fair. Lets do that. We are back at the original UGS gain stage and we can look at a UGS4 situation further down the road and use this thread to inform about any progress.

Perfect because as I mentioned earlier I would prefer to have this separated from this PCB GB, to avoid such untested problems.
And also I know Eric well and trust very much his comments regarding the complexity to make a module with NFET only.

 

[Oneminde]

Probably but I won't do it . I let you redesign an UGS3 or 4 with the matched j74/k170.

I could do that. I have the sch. and pcb design. The latest version to my knowledge is the UGS V3a - see attached schematic.

Would 1206 (3216 metric) resistors work for everyone ? The reason I ask is that Panasonic Era resistors measure among the best and is a really good choice.