cletus monroe

G9 Power Transformer
« on: April 22, 2005, 04:56:03 PM »
Hello All,
Has anyone wired up a G9 using avel lindberg transformers, model # y236103?  They have 8 wires as opposed to the six shown in Frank's
diagram from the NRG site.  WHat to do with them two "extra" wires?
If anyone could help or point me to the right thread I would greatly
appreciate it.
Thanks,
Cletus


peterc

G9 Power Transformer
« Reply #1 on: April 22, 2005, 05:07:17 PM »
If opportunity doesn't knock, build a door.

cletus monroe

Thank you
« Reply #2 on: April 22, 2005, 05:31:19 PM »
Sorry if this is a silly question.  Would I then leave two of the primaries
unconnected from both transformers?  
cletus

Svart

G9 Power Transformer
« Reply #3 on: December 24, 2005, 06:55:44 PM »
what about this one?:



    * Primary 115 VAC, 60 Hz.
    * Designed for small power or bias supplies, test equipment, preamps etc.
    * Economical , 2 hole channel bracket, chassis mount.
    * Minimum 5" long leads.
    * Convenient 6.3 or 12.6 volt filament/auxiliary winding.

Secondary: 250 VCT, 45 mA
Filament winding: 6.3 V, 1 A
Mounting centers: 2.81" u-bracket
Weight: 1 lbs.

it's for tube based amps and it's only 29$
Welcome to the GroupDIY leper colony! when something falls off, we just replace it with a tube!
occupation: General Electron Mayhem

Alesis X2 information repository:
http://www.theopiumdenproductions.

G9 Power Transformer
« Reply #4 on: October 05, 2006, 11:04:08 AM »
Can power xformers be 2x18V 50VA?

gyraf

G9 Power Transformer
« Reply #5 on: October 05, 2006, 11:25:43 AM »
Probably not - that would generate a lot of heat..
..note to self: don't let Harman run your company..

G9 Power Transformer
« Reply #6 on: August 30, 2007, 02:43:21 PM »
I found this transformer at Das Musikding in Germany.

http://www.enregistrersous.com/images/2/110053091620070830205714.html

Is this one will work for the G9 ?

Small power transformer for tube-preamp projects. Primary 230V, secondary 270V 0,08A and 14V 2A.

Diameter: 78mm
Height: 32mm

Thanx

Gregory

G9 Power Transformer
« Reply #7 on: August 30, 2007, 02:59:59 PM »
Or this one ?

[/img]http://www.enregistrersous.com/images/2/110615992520070830211456.html
Small power transformer for tube projects. Primary 230V, secondary 230V 0,12A, 20V 0,12A and 6.3V 4A.

Or
http://www.enregistrersous.com/images/2/71836756720070830212107.html
Small power transformer for tube projects. Primary 230V, secondary 185V 0,04A and 6.3V 1,4A.

Diameter: 63mm
Height: 31mm

Thanx again

Gregory

gyraf

G9 Power Transformer
« Reply #8 on: August 31, 2007, 03:42:15 AM »
Maybe - and maybe not. It's hard to know without trying. The safe thing is to use the recommended parts, that is known-working.

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

G9 Power Transformer
« Reply #9 on: August 31, 2007, 11:15:08 AM »
Yep !
I will start with the recommended parts and give these tranformers a try later.

Thank you Jakob for your fast reply.

Gregory


lofi

G9 Power Transformer
« Reply #10 on: September 04, 2007, 02:43:58 PM »
really stupid question here, i have ended up with a 4U enclosure as i couldn't use it for another project, whats the reason i cant build 4 G9 pres into it?

it looks like theres enough space, and all the 2U examples i have seen have ample room, will the large doughnut things at the back of the cases get too 'noisy' in the box (i'd have 4 in there after all) or are there any other reasons  why not.

i'm a couple of weeks away from finishing the first 4 green pres, so just thinking about the next batch of 4 that i do, and the tubes would be nice.

any advice would be welcome, even if its just to the relevant Meta as at the moment i cant find the reason, and seeing as how you guys build just about every conceivable permutation i was wondering about this one

Iain
Are you professionally stupid, or just a gifted amateur.

Iain Westland (UK)


lofi

G9 Power Transformer
« Reply #11 on: September 07, 2007, 05:58:36 PM »
it wasa stupid question then :oops:  :oops:  :oops:

sorry

Iain
Are you professionally stupid, or just a gifted amateur.

Iain Westland (UK)


beatnik

Re: G9 Power Transformer
« Reply #12 on: February 20, 2010, 06:16:31 AM »

AyGuid

Re: G9 Power Transformer
« Reply #13 on: August 17, 2014, 05:18:06 PM »
Hi ! Does anyone know, if i can use two center tapped regular transformers in an external case for the g9? Im from argentina and its really hard to find toroidal transformers over here.
Thanks 

gyraf

Re: G9 Power Transformer
« Reply #14 on: August 18, 2014, 04:35:06 AM »
center tapped don't work, as the two 15V windings must be isolated from each other for the phantom-doubler to work (see schematic)

Or look in the official G9 help thread, under  / Project Specific Discussions / Preamplifiers

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

AyGuid

Re: G9 Power Transformer
« Reply #15 on: August 22, 2014, 12:53:35 AM »
What about hooking up, the second trafo, the phantom power, and the heater to just one 15v trafo? Would that be ok?

gyraf

Re: G9 Power Transformer
« Reply #16 on: August 22, 2014, 01:42:35 AM »
the two 15V windings must be isolated from each other for the phantom-doubler to work (see schematic)

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


 

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