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I was contemplating the 6 Channel Super Melquiades conversion – it will quite a revision – and I am slowly inclining to make it not 6 Channel but 7 channels…Anyhow, the post will not be about the needs of extra 7th channel but rather about one of the revisions that I am contemplating.

The bass channel of super Melquiades uses the Milq’s driver tube and a full 6C33C. The output transformer is from 7.5Hz (at full power!) to ~900Hz (-1db) and the channel is low-passed at 60Hz, first order. Currently the bass channels stages are coupled with 4 Electrocube 950B capacitors, 2uF each that makes it 8uF. The Electrocube 950B are from my judgment are the most neutral-sounding caps among many that I have tried, however, I always when I listening the caps did it in context of full-range channels. Will the 950 Cubes hold the ground if I make the epicenter of my attention juts the low frequency response?

In the Milq I have ~200V on the 6E6P’ plate and ~-100V on the 6C33C grid. It would make that I would need >350V-400V coupling capacitor. The 8uF that I use forms ~2Hz high-pass filter. I do not need so low but still I would like to stay with 5-10uF capacitor. So, does anyone has in your mind any other cap to propose to me?

Frankly speaking, I would like to confess a heresy that it bubbling up in my mine for a quite while: I would like to use in there electrolytic capacitor, the regular plain-vanilla 10uF/450V Nichicon, or perhaps something similar, none-polarized. I have a feeling that for LF applications the electrolytic are at great advantages, have no conformation thought. Does anyone can comment on it?

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