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-   -   interstage convert to phase splitter (http://www.diyaudio.com/forums/tubes-valves/64607-interstage-convert-phase-splitter.html)

skyraider 20th September 2005 08:19 AM

interstage convert to phase splitter
 
2 Attachment(s)
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

Re: interstage convert to phase splitter
 
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


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