clintrubber

A little gear porn for you, UA's two eleven seventhy six.
« Reply #40 on: September 20, 2006, 03:25:50 PM »
Quote from: "nrgrecording"
If you think Uli is crazy because of the lights in the T1953...
there is a cooler unit out there...

The mighty MAGICIAN T1950 What a great box! Regrettably discontinued.

The bearinger engineering process was something like this:

So you just put their biz-plan on the street... :wink:

I got my '1953 for a GSSL-meter but was indeed initially going for that 8-eyed box. Almost caught one but missed, so I got me the '1953.


clintrubber

A little gear porn for you, UA's two eleven seventhy six.
« Reply #41 on: September 20, 2006, 03:28:11 PM »
Quote from: "nrgrecording"
add a fan to cool down the box BECAUSE of the lights !!!

Looking at my second pic you would indeed feel inclined to start mounting a fan. So has that 8-meter-box indeed a fan ?!  :shock:

CJ

A little gear porn for you, UA's two eleven seventhy six.
« Reply #42 on: September 20, 2006, 06:07:08 PM »
i haven't mounted a fan since the house party on 52 nd st.
If I can't fix it, I can fix it so nobody else can!
Frank's Tube Page: www.mif.pg.gda.pl/homepages/frank/vs.html
Guitar Amps: http://bmamps.com/Tech_sch.html

rodabod

A little gear porn for you, UA's two eleven seventhy six.
« Reply #43 on: September 20, 2006, 06:34:49 PM »
:razz:  :green:  :thumb:
Quote from: tv
punchy fat bastard chip

A little gear porn for you, UA's two eleven seventhy six.
« Reply #44 on: September 20, 2006, 09:54:26 PM »
Quote from: "clintrubber"


But hey, I wasn't there, so...  :wink:
Bye,

  Peter


Can't remember if I was or wasn't  :?
Looks like the main amp board in this box in the same as in the 6176 which doesn't have a S.M.P.S.  At least it didn't...

I.M.O. switchers don't belong in high end audio.

A little gear porn for you, UA's two eleven seventhy six.
« Reply #45 on: September 21, 2006, 12:48:51 AM »
Is there a part number on the input transformer? I see that is is a cinemag. perhaps is an acceptable subsitute for a 0-12 hmm

wilebee

A little gear porn for you, UA's two eleven seventhy six.
« Reply #46 on: September 21, 2006, 01:21:46 AM »
Quote from: "wilebee"
Is there a part number on the input transformer? I see that is is a cinemag. perhaps is an acceptable subsitute for a 0-12 hmm

wilebee


CMLI-15/15B.
Not a direct drop-in sub. for a UTC O-12, requires jiggery-pokery.

gyraf

A little gear porn for you, UA's two eleven seventhy six.
« Reply #47 on: September 21, 2006, 02:47:01 AM »
Quote
The front end looks like re-designed type they were using in the 1176LN for a while. It utilized a bridging (such as 15,000 ohm) 1:1 transformer with larger core (instead of 600 ohm 1.58:1, like the 0-12) and shunted the secondary with a pot (instead of placing a T-attenuator BEFORE the transformer. According to most users this doesn't sound as good, or even similar.


But - it will present a gentler load to the previous stage. Not all equipment sounds good when loaded that hard..

Jakob E.
..note to self: don't let Harman run your company..

A little gear porn for you, UA's two eleven seventhy six.
« Reply #48 on: September 21, 2006, 03:40:37 AM »
Quote from: "Family Hoof"
[...and shunted the secondary with a pot (instead of placing a T-attenuator BEFORE the transformer. According to most users this doesn't sound as good, or even similar.


Not quite correct.  I recall doing two versions of "new" front end for UA using that 1:1 Cinemag.

One version (1176LN) terminated the secondary with a fixed R and, on the primary, had a pair of series R's feeding a shunt pot, then a pair of smaller R's to feed the winding.  The combination of the series R's and the pot (set for no attenuation) gave about a 4dB loss, same as the 0-12 was.  The load on the source was not constant but was always fairly low.  FWIW,  the Cinemag seemed to be fine with the shifting input Z.  
This might not sound the same as a 'T' atten and 0-12 but it is an alternative.   Maybe not a good one if you're building a "clone" :wink: but, IMHO, fine for DIYing etc.

The other version (6176) had a pot on the secondary with a series R feeding the top of the pot to attain the same 4dB drop and also terminate the transformer effectively.  This arrangement presented a constant Hi-Z load to the source...

Quote from: "gyraf"
- it will present a gentler load to the previous stage. Not all equipment sounds good when loaded that hard..
Jakob E.


And some stuff sounds better with a low load which is why, on the 6176, you could switch in the 620R primary loading resistor that I shoved on a switch on the back panel... :green:

Family Hoof

A little gear porn for you, UA's two eleven seventhy six.
« Reply #49 on: September 21, 2006, 10:06:44 AM »
Well thanks for clarifying, Winston! Those solutions make a little more sense than the speculation I'd come to believe.