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Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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Old 10th July 2018, 07:40 PM   #1
buffstereo1 is offline buffstereo1
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Hi folks. May I use a 10,000-10,000 Ohms transformer in place of a 600-600 Ohms transformer? Use = block residual DC from DAC to tube amp? Thanks in advance for your time! Robert
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Old 10th July 2018, 09:09 PM   #2
ErikdeBest is offline ErikdeBest  Switzerland
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Which transformer? Brand and model? How much DC? not all transformers like DC current.
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Old 10th July 2018, 09:14 PM   #3
rayma is offline rayma  United States
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Quote:
Originally Posted by buffstereo1 View Post
May I use a 10,000-10,000 Ohms transformer in place of a 600-600 Ohms
transformer? Use = block residual DC from DAC to tube amp?
No, you'll need a coupling capacitor instead. How much voltage is it?
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Old 10th July 2018, 10:03 PM   #4
buffstereo1 is offline buffstereo1
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Thank you for fast responses!! I want to block any low level DC between my DACs and my amps. So, very low Voltage, and a very small amount. I store music on computer, bypass the sound card with outboard DACs (with no upsampling), and that's my source for music. Yeah, a computer and DAC are sand gear sources, but my tube amps are what I want to provide the cleanest music to. Some people are using Peerless, UTC, or Altec 600-600 transformers. Thank you for your time! Robert
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Old 10th July 2018, 10:07 PM   #5
buffstereo1 is offline buffstereo1
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PS: I appreciate the Capacitor answer, and Voltage questions
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Old 10th July 2018, 10:10 PM   #6
PRR is offline PRR  United States
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Try it.

In that the tube amp input is *probably* over 10K, it "should work".

OTOH you pay big money for a GOOD transformer.

And as said, the transformer does not like eating DC.

Why is there residual DC out of the DAC?? Fix the problem, don't bandage.
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Old 10th July 2018, 10:20 PM   #7
rayma is offline rayma  United States
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Quote:
Originally Posted by buffstereo1 View Post
I want to block any low level DC between my DACs and my amps.
So, very low Voltage, and a very small amount.
If your tube amp has a direct coupled input, it still could handle a small amount of DC
without using a transformer or blocking capacitor. Under say 100mV should work ok.
Depends on the circuit though, which amp is it?

Last edited by rayma; 10th July 2018 at 10:23 PM.
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Old 12th July 2018, 04:08 PM   #8
buffstereo1 is offline buffstereo1
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Cool Transformer 10,000 - 10-000 Ohms etc

Work stole my attention for a couple of days, but thank you all very much for your responses and time. I appreciate the capacitor answer too. They are Edcors, and at the lower price range, (got them on my shelf). I'm guessing some folks like the idea of a low pass filter vs a high pass filter in this respect. It may affect that AC music signal. Cleaning up small residual DC from DAC outputs is the aim. However buying expensive UTCs and such got my attention, although I've never used such between my Teac DACs and Altec EL34 amps, nor noticed hum. Thanks again nice people! Robert
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