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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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29th May 2020, 12:14 am | #21 | |
Moderator
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Location: Fife, Scotland, UK.
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Re: Quad ESL 57 Dummy load
Quote:
But ANY load? I wouldn't put anything expensive ner an intermittent load with a bad connection or sparking. It fits under the 'Any' banner, but would cause fatalities in many amplifiers. David
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29th May 2020, 5:32 am | #22 |
Dekatron
Join Date: Jul 2009
Location: Sleaford, Lincs. UK.
Posts: 7,669
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Re: Quad ESL 57 Dummy load
I use 8 of those Arcol resistors - 2r - on an old welder tunnel HS with a fan on for loads of 200w or so, mine is in stereo DL and has, two 4mm banana jacks as OP, with 3 more so I can use a jumper bar to select speaker/DL, + also 3 BNC's per channel + 10:1 attenuator.
All you need for a simple is a suitable beefy HS, two banana jacks for OP, a drill and 8 self tappers to make a mono dummy load. I then made up two suitable beefy leads for testing. The OP power for a Quad 2 is given as 20w if certain changes are made, so that's 12.5v RMS approx. Andy.
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29th May 2020, 11:33 am | #23 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
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Re: Quad ESL 57 Dummy load
12.5V rms into 8R. Into 15R it'll be around 17.5V rms.
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29th May 2020, 1:39 pm | #24 |
Heptode
Join Date: Jan 2016
Location: Wolverhampton, West Midlands, UK.
Posts: 777
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Re: Quad ESL 57 Dummy load
Thanks for the info guys.
Andy, that sounds like a great device, very ingenious of you. Cheers from Bill. |
29th May 2020, 10:52 pm | #25 |
Pentode
Join Date: Sep 2007
Location: Ranfurly, New Zealand
Posts: 170
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Re: Quad ESL 57 Dummy load
For what it's worth, I have a dummy load set up which is built into my workbench. Uses 4 x 8 Ohm resistors each rated at 300watts so probably a bit overkill for most domestic amplifiers I get to fix
The resistors are wire into a switching set up which allows me to select 8 or 16 ohms (I was also going to incorporate 4 ohms as well but haven't got 'a round tuit' yet), plus switching from load to spkrs and also a set of BNC's so I can also monitor on 'scope regardless. I made this about 25 years ago and it has been through 3 house shifts and 3 purpose built benches.When not in use I repurposed the cut out from benchtop as a cover. Methinks it might need tarting up a bit now as it has been well raced & rallied over that time. Pix are below. Mike |
29th May 2020, 10:55 pm | #26 |
Heptode
Join Date: Jan 2016
Location: Wolverhampton, West Midlands, UK.
Posts: 777
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Re: Quad ESL 57 Dummy load
Great set up Mike, congrats! I really like seeing the things you guys come up with!
Cheers from Bill. |
29th May 2020, 11:34 pm | #27 |
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Re: Quad ESL 57 Dummy load
Some classic stuff there. 180 scope family (tunnel diodes and all) 8601A sweeper, and that little LCR bridge with the phase detector to tell you which way to crank the handle to find the null. TMS500 as well.
Nice! David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done |
29th May 2020, 11:41 pm | #28 |
Heptode
Join Date: Jan 2016
Location: Wolverhampton, West Midlands, UK.
Posts: 777
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Re: Quad ESL 57 Dummy load
I've got a 180A on my list of repair projects. Will definitely need some help with that one!
Cheers from Bill. |
30th May 2020, 12:45 am | #29 | |
Pentode
Join Date: Sep 2007
Location: Ranfurly, New Zealand
Posts: 170
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Re: Quad ESL 57 Dummy load
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Mike |
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30th May 2020, 11:01 am | #30 | ||
Heptode
Join Date: Jun 2017
Location: Southport, Merseyside, UK.
Posts: 646
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Re: Quad ESL 57 Dummy load
Quote:
I quite agree!
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