Gyraf Pultec amplifier
« on: October 19, 2004, 03:56:00 AM »
What do you guys think of using the Gyraf Pultec amplifier/ps board as a standalone tube line amp?  You know, for "warming" and such.  

Trying to think of uses for spares and the like.   :wink:


Kev

Gyraf Pultec amplifier
« Reply #1 on: October 19, 2004, 04:02:54 AM »
YEP
people do this
some also use the BA283 driver stage for the same purpose.

mmm

a Neve driver stage on a PCB ... all buy it's self ... perhaps one could simplify it with some easy to get transistors
 :roll:
how about changing the T03 to an easy to get and fit TIP unit  TIP41 perhaps
might be better than getting stuck with sub standard copies of the original output device.
Kev
DIY Factory

Gyraf Pultec amplifier
« Reply #2 on: October 19, 2004, 04:06:31 AM »
My Pultecs are going to feature Quad Eight line cards for the output.  But I'd like to use the extra boards for something fun.  Tube DI perhaps?  Line snatchurators?   :roll:

Kev

Gyraf Pultec amplifier
« Reply #3 on: October 19, 2004, 04:15:19 AM »
You've only got 18 to 20 dB (I think) but for things like synths, -10dB sources and signals already gained then YES this type of unit can be great.  Use different tubes and output trafos to get the feel you want.

For true Tube DI you may feel that the G9 has more to offer.
Kev
DIY Factory

clintrubber

Gyraf Pultec amplifier
« Reply #4 on: October 19, 2004, 09:54:23 AM »
from Kev:
Quote
For true Tube DI you may feel that the G9 has more to offer.


Could imagine that without too much effort !  :wink:

Standalone-use of the output section does sound good too.

So I'm curious how the SRPP-output sections of the Pultec & G9 compare. They're alike (topology), but use a different tube and a slightly different resistor value here & there.
(sorry if this has been asked before)

I would like to experiment a bit first with a simple/modest trafo - which Edcor-trafo would suit ?  Could a WSM 10k:600 work OK here or is that 10k too high ?

Thanks,

  Peter

rafafredd

Gyraf Pultec amplifier
« Reply #5 on: October 19, 2004, 10:23:20 AM »
try a 5k:20k on the input and a 2k4:600 at the output. Just contact EDCOR. They does custom jobs at no extra cost.

clintrubber

Gyraf Pultec amplifier
« Reply #6 on: October 19, 2004, 10:54:04 AM »
Quote
try a 5k:20k on the input and a 2k4:600 at the output. Just contact EDCOR. They does custom jobs at no extra cost.


This sounds too good to be true ! Do they have a minimum amount on such jobbies ?

Tony dB's Edcor-grouporder leaving soon and the possibility to get custom trafo's. Serious, tell me I'm not dreaming !  :grin:

CJ

Gyraf Pultec amplifier
« Reply #7 on: October 19, 2004, 03:40:24 PM »
good idea, just splice in a 1/4 jack, or xl if your Kev, kind of like an insert on a mixer, that by passes the filterr section, no volume control, unless you invent something.
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


CJ

Gyraf Pultec amplifier
« Reply #9 on: October 19, 2004, 05:57:22 PM »
Wow! Those are some pretty clean Triads.
Very tough to come by these days.
Be careful with those pins. If you look at them wrong, they will snap.

Now if you only had some Peerless S 217 D's to send me!
 :mad:
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


Scenaria

Gyraf Pultec amplifier
« Reply #10 on: October 19, 2004, 06:00:14 PM »
the 217's are special?

I had no clue... I have atleast 70 of those suckers

 :green:

CJ

Gyraf Pultec amplifier
« Reply #11 on: October 19, 2004, 06:10:32 PM »
you sold them off to pay for the Red Bull incident, did ya?
Dasng, if it wasn't for that Pit Bull, I'd had that place picked clean by now.
 :twisted:
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

Scenaria

Gyraf Pultec amplifier
« Reply #12 on: October 19, 2004, 06:22:49 PM »
she's a cat killer :\ struck #4 this past weekend... you would think the cats would eventually learn to NOT go in the backyard... I mean theres a pretty high fence... slowly the cat population is decreasing  :roll:

CJ

Gyraf Pultec amplifier
« Reply #13 on: October 19, 2004, 07:24:15 PM »
Jeez! Call the SPCA!
Do the neighbors know what the scoop is?
Burn the carcasses before they find out.
Now who is gonna kill the roof rats?
 :razz:
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


 

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