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In Reply to: Ruby Electrolytic Caps in signal path of OTL posted by Response34 on December 11, 2004 at 10:52:13:
Depending on the amplifier you intend to drive, you may not need anything like 200uF of capacitance. The value of this cap, figured against the Zout of the preamp's output section AND the Zin of the power amplifier, define the low-end (bass) cutoff of this portion of the system.If the preamp is expecting to drive a 5K input load, it may well require a value as large as 200uF to achieve proper bass cutoff.. However, if that power amp were a 500K load (typical of classic tube power amps), the cap value can decrease almost proportionally (~2uF, anyone?)
My simple OTL preamp has 5uF (or are they 8uF..) REL-CAPS at the output, and driving the 100K Zin of the M-60s, there is more than enough bass.
-B
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Follow Ups
- Are you sure it needs 200uF? - Legendre 09:46:33 12/13/04 (1)
- Re: Are you sure it needs 200uF? - Response34 10:10:34 12/13/04 (0)
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