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Vintage Audio (record players, hi-fi etc) Amplifiers, speakers, gramophones and other audio equipment.

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Old 22nd Apr 2021, 11:14 am   #1
GLENZ32
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Default 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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Old 22nd Apr 2021, 11:25 am   #2
ms660
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Default 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

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Old 22nd Apr 2021, 11:30 am   #3
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Default 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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Old 22nd Apr 2021, 11:33 am   #4
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Default 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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Old 22nd Apr 2021, 11:53 am   #5
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Default 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


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Old 22nd Apr 2021, 1:03 pm   #6
Edward Huggins
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Default 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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Old 22nd Apr 2021, 3:15 pm   #7
ms660
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Default Re: Dulci stereo power amplifier

Quote:
Originally Posted by Edward Huggins View Post
You will find that this version may be very close to the Mullard 3-3 design
Could well be so far as I can make out from this photo:

http://www.hifiworks.co.uk/images_fullsize/dulci6.jpg

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Old 22nd Apr 2021, 5:33 pm   #8
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Default Re: Dulci stereo power amplifier

If the control unit shares the power unit, I think use of EZ81 is preferable.
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Old 22nd Apr 2021, 10:28 pm   #9
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Default 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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Old 26th Apr 2021, 9:20 am   #10
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Default 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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