Dunlap Clarke Dreadnaught 1000 amp - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 24th July 2005, 05:29 PM   #1
diyAudio Member
 
Join Date: Jul 2005
Location: Dorset
Default Dunlap Clarke Dreadnaught 1000 amp

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
  Reply With Quote
Old 25th July 2005, 12:49 AM   #2
djk is offline djk
diyAudio Member
 
djk's Avatar
 
Join Date: Feb 2001
Location: USA
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
  Reply With Quote
Old 26th July 2005, 01:56 AM   #3
diyAudio Member
 
Join Date: Sep 2001
Location: Salt Lake City
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
  Reply With Quote
Old 12th June 2006, 07:58 PM   #4
JJT is offline JJT  United States
diyAudio Member
 
Join Date: Jul 2004
Location: Boston Area
Default Dunlap Clarke Dreadnaught 1000 amp

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
  Reply With Quote
Old 12th June 2006, 08:01 PM   #5
poobah is offline poobah  United States
diyAudio Member
 
poobah's Avatar
 
Join Date: Nov 2005
I still have a BGW... still cranks too!

  Reply With Quote
Old 12th June 2006, 09:46 PM   #6
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Dunlap stands as the best high power solid state designer of
that era. An extremely nice guy as well.
  Reply With Quote
Old 12th June 2006, 09:49 PM   #7
latala is offline latala  United Kingdom
diyAudio Member
 
Join Date: Feb 2006
Location: staffordshire
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
  Reply With Quote
Old 13th June 2006, 01:00 AM   #8
diyAudio Member
 
Join Date: Sep 2001
Location: Salt Lake City
Would love to see the schametics if at all possible...

Thanks!

Mark
__________________
KSA-100 WIKI
  Reply With Quote
Old 28th April 2007, 04:50 PM   #9
diyAudio Member
 
Join Date: Jan 2006
Location: Kentucky
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.
  Reply With Quote
Old 28th April 2007, 05:06 PM   #10
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
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.

  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Dunlap -Clarke Dreadnaught 500 Power/ amp. Raymond Solid State 14 27th April 2009 11:57 AM
Dunlap- Clarke Dreadnought 500 Power Amp Raymond Solid State 1 25th November 2008 10:12 AM
Arthur C. Clarke died abzug The Lounge 5 2nd April 2008 06:54 AM
Dunlap- Clarke Dreadnaught 500 Raymond Solid State 0 19th March 2006 10:14 PM


New To Site? Need Help?

All times are GMT. The time now is 06:41 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2