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Hampton MC preamp
Hampton MC preamp
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Old 11th November 2010, 12:19 PM   #1
vacuumhead is offline vacuumhead
diyAudio Member
Join Date: Jul 2002
Location: South Africa
Default Hampton MC preamp

Hi all,

need opinion - is it possible to use E80CC instead of ECC88 in Hampton MC preamp? Will it be better

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Old 11th November 2010, 12:34 PM   #2
costis_n is offline costis_n  Greece
diyAudio Member
Join Date: Aug 2008
Without even looking at the schematic (actually having no idea What a Hampton preamp is) , I can tell you that E80CC and ECC88 are very different valves, only the pinout is the same. How did you get the idea that they are interchangeable? Maybe you meant E88CC? This would be compatible, ie same valve, different specs (long-life, microphony, noise etc). If you plan to swap E88CC for ECC88, you are not going to do any harm. The sonics will likely change a little (possibly for the better), but this is subjective. Try and see what you like best.
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Old 11th November 2010, 02:14 PM   #3
Eli Duttman is offline Eli Duttman  United States
diyAudio Member
Join Date: Apr 2004
Location: Monroe Township, NJ
Point blank, tubes are simply not quiet enough to drive directly with a LOMC cartridge. Either you use a hybrid cascode, ala Allen Wright, or you use a step up transformer (SUT) at the I/P of a "conventional" tubed phono circuit.

At the μV. signal level LOMCs produce, S/N considerations are paramount. IMO, the only tube with a snowball's chance in Hell of doing the job adequately well is the 6C45П (6s45p). The type is difficult to work with, as it will oscillate if you glance at it too hard. Why struggle to obtain a marginal result? SUTs and hybrid cascodes have a "track record" of doing the job well.
Eli D.
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