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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment. |
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22nd Apr 2021, 12:14 pm | #1 |
Hexode
Join Date: Apr 2008
Location: Wellington, New Zealand
Posts: 289
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Dulci stereo power amplifier
Hi guys, I have this Ducli single ended stereo power amplifier using an EZ80, and a single EF86 & EL84 per channel that I'm after a circuit diagram for, mostly complete by someone has been at it and there are components missing. It looks like a DPA10 but obviously isn't a mono amp Image attached is what one looks like and mine has no identification model number. I'm guessing it's similar to a Mullard design from the era? Thanks in advance
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22nd Apr 2021, 12:25 pm | #2 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Dulci stereo power amplifier
Looks like an SP44:
http://www.hifiworks.co.uk/images_fullsize/dulci.jpg http://www.hifiworks.co.uk/images_fullsize/dulci5.jpg Lawrence. |
22nd Apr 2021, 12:30 pm | #3 |
Hexode
Join Date: Apr 2008
Location: Wellington, New Zealand
Posts: 289
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Re: Dulci stereo power amplifier
Hi Lawrence, yes that's the beast thanks for that useful info. I accidentally put this post in th e wrong forum and have contacted the moderator to ask that it be moved to the correct place
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22nd Apr 2021, 12:33 pm | #4 |
Octode
Join Date: Dec 2018
Location: Llandeilo, West Wales, UK.
Posts: 1,092
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Re: Dulci stereo power amplifier
SP44 or SP55.
Chassis on the SP44 is 6'' x 111/2'' x 51/2'' SP55 is 6'' x 111/2'' x 71/2'' SP44 at a guess.
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22nd Apr 2021, 12:53 pm | #5 |
Dekatron
Join Date: Apr 2019
Location: Worthing, West Sussex, UK.
Posts: 6,604
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Re: Dulci stereo power amplifier
I initially thought that it might be similar to the Mullard design listed in Post # 20 of this linked Thread but now see that this particular Mullard design uses ECL86's and a different rectifier valve.
https://www.google.com/url?client=in...kov1biG4wE-FOb David |
22nd Apr 2021, 2:03 pm | #6 |
Dekatron
Join Date: Sep 2015
Location: Southwold, Suffolk, UK.
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Re: Dulci stereo power amplifier
The OP's photo under #1shows the correct control unit for this. The Stereo-8, a much more complex pre-amp shown in #2, was normally supplied wth the DPA10s. You will find that this version may be very close to the Mullard 3-3 design, as was the DPA10 to the 5-10. We had a Trade Account with DULCI. I can't quite remember how the EF86 was coupled to the EL84 though? Dulci used quite good components. Although the OPTX may loook a tad small, they are adequate for the job and better than many.
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22nd Apr 2021, 4:15 pm | #7 | |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Dulci stereo power amplifier
Quote:
http://www.hifiworks.co.uk/images_fullsize/dulci6.jpg Lawrence. |
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22nd Apr 2021, 6:33 pm | #8 |
Nonode
Join Date: Jun 2013
Location: Surbiton, SW London, UK.
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Re: Dulci stereo power amplifier
If the control unit shares the power unit, I think use of EZ81 is preferable.
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22nd Apr 2021, 11:28 pm | #9 |
Hexode
Join Date: Apr 2008
Location: Wellington, New Zealand
Posts: 289
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Re: Dulci stereo power amplifier
Thanks everyone for providing some more information on this, at least that image of that one underneath will give me a guide to go by By all accounts it should be a nice little performer once up and running and will run my old Tannoys without a problem no doubt.
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26th Apr 2021, 10:20 am | #10 |
Octode
Join Date: Feb 2009
Location: Wallasey, UK.
Posts: 1,314
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Re: Dulci stereo power amplifier
Some really good links here to the Mullard 44, including a schematic and complete assembly manual in Italian, but fairly easy to follow. https://audiokarma.org/forums/index....44-amp.879461/
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