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In Reply to: Re: Ruby Electrolytic Caps in signal path of OTL posted by Lew on December 13, 2004 at 07:45:13:
I thought I had mentioned the unit in the beginning. The preamp is the ASL Twin Head mk III.
What I am finding with this unit in OTL output mode is a more lively sound with more extension. Also much more gain in OTL mode vs transformer output.
And yes, it does have 200uF of capacitance at the output.
Follow Ups:
So I take it that there is 200uF of capacitance in series with the output signal from the last tube in the circuit, when you bypass the output transformer. If so, there ought also to be a resistor in parallel (i.e., wired from the hot pin of the output jack to ground, altho the resistor may not actually be soldered to the output jack at all; it could physically be placed in a variety of ways). Can you tell us the value of that R? And can you tell me what "ASL" stands for?
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Found it on the ASL website (or that of an ASL dealer). This is apparently a very unusual preamp with 2A3 output tubes that require output transformers or alternatively the large coupling caps. Surprising that the transformer outputs do not sound better than than the capacitor-coupled outputs, where the caps are electrolytics.
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