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Old 5th March 2011, 08:18 AM   #16001
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Well that's annoying, sadly hardware, modded or not, do fail :'(
Take it easy
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Old 5th March 2011, 09:45 PM   #16002
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Quote:
Originally Posted by SimontY View Post
Matthieu, I've never had a tube amp, only owned a Sherwood receiver (A/B solid), Roksan Kandy (A/B solid), Roksan Caspian (A/B solid), LM3886 DIY chip amp (class B chip), Marantz MA500s (monoblocks class A/B solid) and Carlsbro PA amp (class A/B solid).

Currently the rig is bass on modded Carlsbro amp and mid & tweet on LM3886. There's no trace of the class T problems and not a tube or class A beast in sight.... though a class A amp would deliver quite the opposite of the T-amps in some areas (ie weak areas replaced by strong yet both delivering much detail and openness). As far as I can hear the closer you are to class A the better an amp is likely to sound (other variables blurring this "truth" to varying degrees.) Amps like Brent has (mostly class A) or Lee has (again, mostly class A) show, to my ears, that it's the only way to go. Only time I've heard Pass Aleph amps I also felt it was 100% correct with no weakness. From the few dozen amps or systems I've heard it seems unless it's class A (or maybe at least very low crossover distortion - as maybe attained by the LM3886 and similar good power op-amps) you just don't get the natural life in the midrange, an open sound or natural detailing. It will always be a bit compressed and nasal with somewhat etched and tiresome transients and sibilants.
Just purchased a chinese amp a yaquin mc 10L VALVE job what an amp 50 watts rms into 8omns so smooth my mordant shorts love it . ive got 2 or 3 class a amps here no where close to what im hearing from this 300 gbp amp .
cheers alan
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Old 6th March 2011, 01:29 AM   #16003
poynton is offline poynton  United Kingdom
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Originally Posted by bikeral10 View Post
Just purchased a chinese amp a yaquin mc 10L VALVE job ..................
I hope you've read the various threads about these Chinese amps.
They seem to fry themselves and some have earth and other faults.


Andy

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Old 6th March 2011, 07:28 AM   #16004
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Originally Posted by poynton View Post
I hope you've read the various threads about these Chinese amps.
They seem to fry themselves and some have earth and other faults.


Andy

.
The problem with chinese amps is the voltage 220v mine so i dropped the input to 220v via a tranny runs sweet now did get hot at first cool now heater voltage @6.3v as el34bs should run overall a well made amp just needed a few tweeks. ( think they have modded them @ the factory now to gb voltage 240 .)
thanks alan.
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Old 6th March 2011, 08:56 AM   #16005
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Yep my PP KT88 wan chinese pos.
The TA2024C also... but sounds milles better. I've compared it to a similar PP TK88 YaQin and this was of normal quality, but yes no chassis earth, nor delay for heating tubes or 6.3V...
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Old 7th March 2011, 09:04 AM   #16006
Cola is offline Cola  Singapore
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From the schematic, the transformer output voltage for CD67SE and CD63SE are indentical except for CD63KI which has a slightly lower output voltage. I wonder can the toroidal transformer from the CD67KI be installed on the CD67SE directly?

Any advise? Thanks
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Old 7th March 2011, 04:59 PM   #16007
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Yes it can

Brent
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Old 7th March 2011, 05:11 PM   #16008
Cola is offline Cola  Singapore
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Originally Posted by rowemeister View Post
Yes it can

Brent
Thanks, but I also realised that the output on U311 and U312 for 67SE are about 1.9v while the 63KI are 0v and 3.4v respectively according to specs.
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Old 7th March 2011, 05:37 PM   #16009
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I've not got the manual to hand. Is that for the display voltage? I'm sure that part of the circuit is exactly the same on both models

Brent
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Old 10th March 2011, 06:14 AM   #16010
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I'm having fits of anxiety! will my 67' reach Brent safely (yet again)?
Will he find everything has been fried? will it be a simple fix? am I nuts? Reassurance would be appreciated!
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