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Old October 10th 04, 04:48 PM posted to uk.rec.audio
Jim Lesurf
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Posts: 3,051
Default Good amps all sound the same do they?

In article , Dave Plowman (News)
wrote:
In article , Jim Lesurf
wrote:
My recollection is that the 33 does not have a very flat response even
with the controls set as near flat as possible compared with more
modern units. FWIW my experience is that even quite small changes in
overall response can be audible.


It has, of course, got a tone control bypass switch.


You are correct. :-) Must admit I'd forgotten that the 'cancel' button
defeated the tone controls as well as the HF filter.

However I am not sure that it also bypasses the LF filter that has a set
rolloff, nor the tendency for the preamp to roll away at HF. The 'flat'
specs I have for it say +/-0.5 dB from 30Hz to 20kHz. However I'd tend to
suspect that this would allow for a response that was audibly different
from +/- 0.1 dB 20Hz to 20kHz, albiet quite a modest change compared with
something like a speaker. Certainly my recollection is that this is the
case with the 33, but I haven't listened to or measured one for many years.

IIRC, the pickup preamp had distinctly marginal headroom on the 33.


Depends upon the settings on the 'hoovermatic' card I guess. :-) The specs
I have say only 40mV overload for the 2mV sensitivity MM input, and 120mV
for the 5.6mV sensitivity, but does not indicate how this may vary with
frequency.

Slainte,

Jim

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