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How to add a balanced output to a Tube Preamp ?
How to add a balanced output to a Tube Preamp ?
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Old 5th June 2018, 12:16 PM   #1
blackwhaleamp is offline blackwhaleamp  Belgium
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Default How to add a balanced output to a Tube Preamp ?


I want to add a balance output on this amplifier (see attachement). The idea is to take the signal from the pre-amp and not from the output.

I was reading several threads and I found out that this transformer could do the trick

Audio-Ubertrager 1:1/2:1 fur Line-Signale LTR-110 - Tube-Town GmbH

There is a suggestion about how to connect it. But the signal is coming from the output.

Does anyone know if I could use the same transformer at the pre-amp? Like where should I connect it?

Thank for any suggestion
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Old 5th June 2018, 12:26 PM   #2
JMFahey is offline JMFahey  Argentina
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YouŽll need to add a buffer Op Amp which is able to drive that transformer.
What kind of signal do you want to send it?

If post EQ and both channels available, I would suggest measuring signal at the Master Volume hot leg.
You need to attenuate such signal to 100mV RMS which is about what a direct box sends to the mixer.
Design/make/service musical stuff in Buenos Aires, Argentina, since 1969.
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Old 6th June 2018, 07:53 AM   #3
indianajo is offline indianajo  United States
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The plate of the driver triodes is push pull. They appear to be opposite in phase. You just need to attenuate the voltage swing to a proper output voltage.
Hammond did this all the time to drive their tone cabinets. They produced a roughly 7 vac signal biphase to run down the cable parallel to the 120 vac to the tone cabinet.
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300
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