sysfail
500+ Head-Fier
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- Feb 1, 2011
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I've got a perfect set of tubes for you for fixing exactly your observations: Siemens ECC85
I've posted my thoughts on this tube elsewhere in this thread.
When I had my HD800 I thought the stock set up was dry sounding. The ECC85 has much better low end than stock and a generally warmer sound. PM me, I have a pair I can part with for within your budget. No hum and not microphonic.
Thanks for the reply! Any idea how it would be with the HD600? How do they compare with the Amperexes?