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Old 7th March 2003, 10:27 PM   #1
Raymond is offline Raymond  United Kingdom
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Question Dunlap -Clarke Dreadnaught 500 Power/ amp.

Hello to all,
I'm a new member and this is my first thread...
Does anyone have any information on the Dunlap-Clarke Dreadnaught 500 power/amp? The only info I have on this model is that it was made in the U.S.A. circa 78, it was imported to England by Exposure Electronics before they made their own amplification. I believe it delivers about 600watts R.M.S. per channel into a 2ohm load and that's all the info I have on the unit.
Can anyone enlighten me?
Regards
Raymond.
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Old 9th March 2003, 12:27 AM   #2
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Well, it's been about 28 years, but I had occasion to peer inside one, and it seemed to be a conventional push-pull AB follower with a really big output stage. It recall that it had MJ802 and MH4502's (I could be mistaken) which were the biggest BJT's you could get back then and some serious fans.

I subsequently had a nice conversation with the designer (Ron Dunlap?) at a show. A very smart, nice guy, who by then had quit the business for other pursuits.

Probably not even Jam has schematics for this, but it was a simple enough circuit that you could reverse engineer it or otherwise service it if you had to.
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Old 9th March 2003, 03:38 AM   #3
jam is offline jam  United States
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You are right Mr.Pass, I dont.

Jam
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Old 9th March 2003, 06:22 AM   #4
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Single ended diff inputs with an active current source for the VAS (like a Pass A40). 2N6030/5630 outputs parallel connected in the D250, series/parallel connected for the larger amps (like a Dynaco ST416). I think I still have the schema for the preamp and D250 power amp.
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Old 9th March 2003, 11:59 AM   #5
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i need to a circuit of 600W RMS AMP to 2 - 1 Ohm speakers...
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Old 9th March 2003, 12:06 PM   #6
Raymond is offline Raymond  United Kingdom
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Thank you Nelson,DJK and Jam for your positive response.
I bought the amplifier here in England together with the matching pre-amp, the power amp sounds a lot better than some of the well respected designs..... I use it with a Naim 42.5 pre/amp at the moment and it sounds very detailed and informative. I think that the power caps will need replacing as they are the original ones. I don't use the matching pre/amp as it sounds very constricted. My speakers are Linn Isobariks so I opted for an amplifier that will deliver a fairly large output into a low impedance load "I think the Linn's drop to 2ohm.
Thanks again.
Regards to you all.
Raymond.
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Old 9th March 2003, 05:31 PM   #7
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Quote:
Originally posted by djk
Single ended diff inputs with an active current source for the VAS (like a Pass A40). 2N6030/5630 outputs parallel connected in the D250, series/parallel connected for the larger amps (like a Dynaco ST416). I think I still have the schema for the preamp and D250 power amp.
Great! Please post it if you can find it.
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Old 9th March 2003, 09:01 PM   #8
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Default Re: Dunlap -Clarke Dreadnaught 500 Power/ amp.

Quote:
Originally posted by Raymond
Dunlap-Clarke Dreadnaught 500 power/amp?
We had one of those thru the shop when i worked hifi. Not sure which one. Nice amp, but became unobtainable.

dave
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Old 9th March 2003, 09:22 PM   #9
Raymond is offline Raymond  United Kingdom
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Default Re: Re: Dunlap -Clarke Dreadnaught 500 Power/ amp.

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Originally posted by planet10


We had one of those thru the shop when i worked hifi. Not sure which one. Nice amp, but became unobtainable.

dave
Thanks for the info Dave. It does sound nice, although it's quite old and there are better power amps out there it's the best power amp I have heard for quite a while and it cost me peanuts.


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Old 9th March 2003, 09:52 PM   #10
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Default Re: Re: Re: Dunlap -Clarke Dreadnaught 500 Power/ amp.

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Originally posted by Raymond
it's the best power amp I have heard for quite a while and it cost me peanuts.
The Frugal-phile(tm) in me loves those peanuts. Did you ever have a NAIM power amp in your system?

At the time we had the DC we were also selling NAIM 160s & 250s. The NAIMs were a bit more refined, but didn't have the balls of the DC.

dave
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