chinese valve amps/ general matching up (Off Topic)

by GC, Thursday, May 04, 2006, 19:53 (4275 days ago)

1. I have a pair of Lowther PM6 drivers which will soon be put to use in my 'about to be purchased just as soon as i can make a decision which ones' Oris horns. I'm looking into suitable amps to drive these and thinking the chinese options look good value. In particular: http://www.apah69.dsl.pipex.com/dynavox/dynavox.htm and www.audioclassics.co.uk/budgetamp.htm. Does anyone have any experience with these or similar??

2. The second issue is bass. I'll be using my existing Music Fidelity MA50 Class A Mono bloc amps, which should be more than adequate. Anyone any suggestions for suitable base cabinet/driver??

3. Crossovers. Very confusing.


Any advise or personal experience would be very much appreciated!!

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chinese valve amps/ general matching up

by Bert @, Friday, May 05, 2006, 00:35 (4275 days ago) @ GC

Hi Justin,

1. I have a pair of Lowther PM6 drivers which will soon be put to use in my 'about to be purchased just as soon as i can make a decision which ones' Oris horns.

For the PM6A's I would suggest the Oris 250's. The Oris 150's can be used also but the tonal balance with your drivers might be a bit "dark" or on the dull side. Within the Oris 250's you'll gain much more openess and clarity.

I'm looking into suitable amps to drive these and thinking the
chinese options look good value. In particular:
http://www.apah69.dsl.pipex.com/dynavox/dynavox.htm and
www.audioclassics.co.uk/budgetamp.htm. Does anyone have any experience
with these or similar??

I have no experience with either of these brands. A very low noise figure would be needed though...

2. The second issue is bass. I'll be using my existing Music Fidelity MA50 Class A Mono bloc amps, which should be more than adequate. Anyone any suggestions for suitable base cabinet/driver??

I can only suggest the BD15 in their Reference Compact enclosure. Your own amps will be suitable to drive these well..

3. Crossovers. Very confusing.

Not so confusing. Its the options available and the bass system used that makes things less clear. I can help you with that when needed though and optimally when you decide for the Reference Compact bass system.

Ciao,

Bert

--
BD-Design - Only the Best!

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chinese valve amps/ general matching up

by jdunham @, Wednesday, May 17, 2006, 16:08 (4262 days ago) @ GC

Hi Justin,

Regarding amps - I bought a very low cost Bez 2A3 SET amp as a "back up", and whilst I was upgrading and making my other amps. It is surprisingly good. I paid less than £250 for it brand new, but bought some better valves for it, which improved it quite a bit. There was one that went s/h on ebay recently http://cgi.ebay.co.uk/Bez-2a3-amp-RCA-SET_W0QQitemZ9718239714QQcategoryZ14973QQssPageNa.... I hear that the Bez 300b SET monoblocks are also very good. The good thing about many of the cheapo ones are that they are a good basis for improvement as long as you choose one that has been wired point to point.

2. The second issue is bass.

You have many choices here from Bert's options which are obviously well regarded and tried and tested. Or there are various other systems as used by others, and this will carry more risk - but could be more fun if experimenting is your sort of thing!

If you look at the pictures of my Oris 200 system in the showroom, you will see my own open baffle bass system. I am really pleased with the results of this, having tried a number of other approaches.

If you are in the UK and fancy a trip to me in Surrey for a listen, then please feel free to get in touch.

Kind regards,

Jonathan

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chinese valve amps/ general matching up

by GC, Thursday, June 08, 2006, 17:03 (4240 days ago) @ jdunham

Hello Jonathan,

I have just completed some mods on the BEZ 2A3 and it now works superbly; replace volume pot with Korean stepped attenuator (£35), change CLC power supply to LC config (move 100uF cap in front of choke to other 100uF behind choke) replace cheap 3H choke with something like a 5 or 8 Henry potted choke (I got mine from the vintage Hi Fi shop in Bell St, London - £15)

Time to do: 3hrs
result: a much, much better amp - particularly in the bass

Andy

Hi Justin,

Regarding amps - I bought a very low cost Bez 2A3 SET amp as a "back up",
and whilst I was upgrading and making my other amps. It is surprisingly
good. I paid less than £250 for it brand new, but bought some better
valves for it, which improved it quite a bit. There was one that went s/h
on ebay recently
http://cgi.ebay.co.uk/Bez-2a3-amp-RCA-SET_W0QQitemZ9718239714QQcategoryZ14973QQssPageNa....
I hear that the Bez 300b SET monoblocks are also very good. The good thing
about many of the cheapo ones are that they are a good basis for
improvement as long as you choose one that has been wired point to point.

2. The second issue is bass.


You have many choices here from Bert's options which are obviously well
regarded and tried and tested. Or there are various other systems as used
by others, and this will carry more risk - but could be more fun if
experimenting is your sort of thing!

If you look at the pictures of my Oris 200 system in the showroom, you
will see my own open baffle bass system. I am really pleased with the
results of this, having tried a number of other approaches.

If you are in the UK and fancy a trip to me in Surrey for a listen, then
please feel free to get in touch.

Kind regards,

Jonathan

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