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-   -   Dulci stereo power amplifier (https://www.vintage-radio.net/forum/showthread.php?t=179242)

GLENZ32 22nd Apr 2021 11:14 am

Dulci stereo power amplifier
 
1 Attachment(s)
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 ;D 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 :)

ms660 22nd Apr 2021 11:25 am

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.

GLENZ32 22nd Apr 2021 11:30 am

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 :)

snowman_al 22nd Apr 2021 11:33 am

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.

DMcMahon 22nd Apr 2021 11:53 am

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

Edward Huggins 22nd Apr 2021 1:03 pm

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.

ms660 22nd Apr 2021 3:15 pm

Re: Dulci stereo power amplifier
 
Quote:

Originally Posted by Edward Huggins (Post 1366940)
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

Lawrence.

Restoration73 22nd Apr 2021 5:33 pm

Re: Dulci stereo power amplifier
 
If the control unit shares the power unit, I think use of EZ81 is preferable.

GLENZ32 22nd Apr 2021 10:28 pm

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.

qualityten 26th Apr 2021 9:20 am

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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