KT120 x 4 / 240W Push Pull TUBE AMP MONOBLOCKS - diyAudio
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Old 11th April 2015, 04:28 PM   #1
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Default KT120 x 4 / 240W Push Pull TUBE AMP MONOBLOCKS

Has anyone of you dear members built the 4 x KT120, 240W push-pull tube power amp, designed and described in details by Mr. Gerhard Haas in an article issued in the November 2014 volume of AudioXpress audio magazine?

I have not been able to find the suitable output and power transformers as the PMZ 135/50 transformer core material seems to be unavailable from the supplier. See the photo attached showing the table with transformer specifications in the artice. Any help from your side ?
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Old 11th April 2015, 05:53 PM   #2
Zibi is offline Zibi  Poland
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Old 11th April 2015, 06:36 PM   #3
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For the Output transformer a Hammond 1650W seems suitable. 1,9K and 4,8,16 ohm taps, whit a 8 ohm speaker on the 4 ohm tap you should be all set.

As for the power transformer, Industrial transformers that supply 480VAC are common, you'l only need a 6V heater transformer and a little 120v transformer for bias (I would opt to stabilize the bias voltage)
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