Dunlap Clarke Dreadnaught 1000 amp

[Richard Swann]

Hi,

I have a dunlap clarke dreadnaught 1000 power amp that i picked up second hand. It sounds great & i have been told its a good piece of kit... it certainly built like it is !

I cant seem to find much info on the net about them & i was wondering weather anyone knows of the spec of this amp such as watts rms per channel into 8,4 & 2 ohms ( presuming its stable @ 2 ohms ).

Any other info would be usefull as i'd like to know a bit more about the amp.


Thanks in advance

[djk]

I think it was 500W/8R per channel.

Each channel was a bridged output stage if I remember correctly, about ±60V, 2N6031/2N5631 outputs.

Drives 4R OK, 2R is a death wish.

http://home.rochester.rr.com/bkdavis/dunlapclarke.jpg

[Mark A. Gulbrandsen]

Originally I think it was three partners... Dunlap, Clarke, and McMurrow as some of the amps had the initials DCM on them. They made about a half dozen models. I remember those guys very well at the Hi-Fi shows back in the mid 70's. They were real nice guys too, I wonder what ever happened to them. The stuff was built like a tank, especially considering the state of semiconductor technology back then, which compared to today was pretty crude. I always wanted to latch onto any one of them just as a piece of memorabilia. If anyone runs into one thats available please let me know...... BTW: that was the same time period as the BGW "Arc Welders Special".

Mark

[JJT]

My schematic of the front end shows 2n5550/2n5560 input trans,
inline voltage reg between both halfs of the driver. The driver
is on plug in boards, like PC cards. IF I remember right,
and the pix helped, it was 500wrms into 8 ohms. Ruggerd,
LOUD stuff, sold local here by a HiFi store (still on rt9),
I forget the name, but back then it was the BIG fancy
HiFi store..oh yes, 'Natural Sound' is the name.

http://www.natural-sound.com/

I called them, and they remember it, but long ago.

My schematic shows 1974.

They are big blueprint sheets, or' Id post them,
maybe I can shrink the driver stage down.


JJT

[poobah]

I still have a BGW... still cranks too!

[Nelson Pass]

Dunlap stands as the best high power solid state designer of
that era. An extremely nice guy as well.

[latala]

I seem to remember that John Farlow who went on later to design and market Exposure amplifiers @ hove near Brighton had something to do with these
Iam not totally sure as I have not seen John for about 20 years
As I remeber he was a nice Guy who would help if he could
Also he used to ride a Ducatie and as a biker he can not be all bad Regards Trev

[Mark A. Gulbrandsen]

Would love to see the schametics if at all possible...

Thanks!

Mark

[Don Nebel]

Hello, I just bought a Dunlap Clarke Dreadnaught 1000 amplifier on ebay. I paid $100. I went to the local library and found in the 1979 Audio magazine annual buyers guide that the amp was rated 250 watts per channel into 8 ohms and 800 watts per channel at 2 ohms. The amplifier had a retail price of $1,500.00 and was made in Waltham, Ma. USA. It weights 75 pounds. The amplifier has (4) 2N6609 and (4) 2N3773 output transistors per channel and a 114vct. 15 amp transformer.I bought the amplifier Knowing that it needs repair and I have not attemped to plug it in. There are not any burned traces or components visible in the amplifier but, there are some unattached wires. I would like to locate a owners and a service manual for this amplifier.What should I check before I plug this thing in and turn it on? I understand that this amplifier is a rare item and I don't want to cause any damage that can't be repaired.

[Nelson Pass]

If you can't get an owner's manual, you can try tracing the
circuits of what you've got. I know a little bit about it, but an
actual schematic would be helpful and interesting to everybody.

I don't doubt that with some help you can get this restored,
and as a classic piece, I think it's worth the effort.