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- Mar 21, 2007
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I recently built a simple 2 stage balanced OTL amp for the HD800. The amp is a 112a DHT voltage amplifier directly connected to a paralleled 6BX7 cathode follower. Output impedance is about 100 ohms, which is fine for the 300 ohm HD800's. The output capacitor is currently a generic 70uf motor-run PIO. For what it is, the amp sounds surprisingly good. I'm interested in upgrading the output caps. Would like to keep the cost around $300.00. So I'm looking for a quad of film or PIO caps in the 50+ uf / 250V range. Any suggestions from you cap guys?. Currently I'm considering Mundorf M "tube caps" Obbligato film power supply caps, and perhaps the Obbligato gold signal caps. Also looking at some of the Russian military surplus stuff. Since the amp is DIY, space isn't an issue. Any practical alternatives I've missed ?