| Re: tried the 6688 [message #31906 is a reply to message #31905] |
Wed, 21 June 2006 00:17   |
Damir
Messages: 1005
Registered: May 2009
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Illuminati (2nd Degree) |
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Strange - as I described it, my D3a and E180F tubes sound very similar, D3a a bit more "rough", and E180F little more "smooth". But both have a dynamic, open and direct, powerfull sound.
I think that with choke load you should use bypassed cathode, if not - rp of the triode goes up, not a good thing in combination with L and Cw of the choke (both frequency extremes). Maybe try the bypass first, say 100µF-220µF.
But, I noticed in 6SN7 test that, although similar, there`re differences between the tubes of the same type. Some sound "big, open, clean", and other more in "blanket, compressed, warm, unfocussed" way.
As I said, my pair of E180F is NOS Philips, unfortunately didn`t try other types.
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