interstage convert to phase splitter

skyraider · 20th September 2005, 08:19 AM

Hi,

I have some interstage on hand and I would like to know if it is possible to use it as phase splitter by connecting voltage divider resistors. Will this work?

Miles Prower · 20th September 2005, 09:17 AM

Yes.

skyraider · 20th September 2005, 10:06 AM

Quote:

Yes.

Thanks for reply

another issue, the trans is rated 10k:10k. What values should I use for the divider resistor, lets say if i want to use it to drive 2a3?

Gluca · 20th September 2005, 10:18 AM

I am using 50k on each leg (if my memory is not failing). It depends on the max grid leak resistor you can use and on the tranny: you can find the best value using a o/scope and looking for resonances, freq response and square wave steepness/ripples.

Make sure the resistors are matched: I am using 2*100k 1% in parallel for each leg to minimize the mismatch.

Ciao.

Guido Tent · 20th September 2005, 10:25 AM

Quote:

Originally posted by skyraider
Hi,

I have some interstage on hand and I would like to know if it is possible to use it as phase splitter by connecting voltage divider resistors. Will this work?

it will work but the asymmetry in capacitances and swing will make the 2 signals very different, especially at higher frequencies.

best

Gluca · 20th September 2005, 03:35 PM

mmm that's not my case as my IT is PP to PP, but I splitted an input tranny that was not coming with a CT using a couple of resistors.

I did not notice anything odd with my o/scope ... what should I look at?

ciao

Guido Tent · 20th September 2005, 03:51 PM

Quote:

Originally posted by Gluca
mmm that's not my case as my IT is PP to PP, but I splitted an input tranny that was not coming with a CT using a couple of resistors.

I did not notice anything odd with my o/scope ... what should I look at?

ciao

Ciao Gluca

You may apply a squarewave (1 to 10 kHz) to the input of the tube, and watch both output of both halves. These should remain equal in bandwidth, phase and amplitude.

best

Gluca · 20th September 2005, 06:38 PM

Oh thanks. I did and I rememeber they looked pretty much the same ... I assume this is not an issue with my input tranny hooked up that way.

Great tip for the future.

Re
Gianluca

skyraider · 21st September 2005, 01:16 PM

thanks y'all

20th September 2005, 09:17 AM	#2
Miles Prower diyAudio Member Join Date: May 2005 Location: USA Blog Entries: 2	Yes. __________________ There are no foxes in atheistholes www.dolphin-hsl.com

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20th September 2005, 10:18 AM	#4
Gluca tarmac ripper diyAudio Member Join Date: Nov 2004 Location: Back to Italy	I am using 50k on each leg (if my memory is not failing). It depends on the max grid leak resistor you can use and on the tranny: you can find the best value using a o/scope and looking for resonances, freq response and square wave steepness/ripples. Make sure the resistors are matched: I am using 2*100k 1% in parallel for each leg to minimize the mismatch. Ciao.

20th September 2005, 03:35 PM	#6
Gluca tarmac ripper diyAudio Member Join Date: Nov 2004 Location: Back to Italy	mmm that's not my case as my IT is PP to PP, but I splitted an input tranny that was not coming with a CT using a couple of resistors. I did not notice anything odd with my o/scope ... what should I look at? ciao

20th September 2005, 06:38 PM	#8
Gluca tarmac ripper diyAudio Member Join Date: Nov 2004 Location: Back to Italy	Oh thanks. I did and I rememeber they looked pretty much the same ... I assume this is not an issue with my input tranny hooked up that way. Great tip for the future. Re Gianluca

21st September 2005, 01:16 PM	#9
skyraider diyAudio Member Join Date: Jan 2004 Location: malaysia	thanks y'all

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