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Old 5th February 2010, 07:59 AM   #1
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Default Cambridge audio P35 schematic wanted

come in to the shop seriously vandalised

probably repaired in the past by a TV repair Guy,,,, outpout tranistors are 6 diferent types !!!

so schematic is needed

regards sakis
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Old 11th February 2010, 04:01 PM   #2
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ok this is not working no replies about the schematic but that is ok i will manage without it

i will also post pictures of the mess i found inside that will be really funny since transitors inside the amp was diferent types, brands, models, with reversed pins at every stage

beyond that its a classic amp as we know it LTP + CCS ...no bootstrap ... with vbe and four transitors in the outpout stage per amplifier EFP configured

the machine is very low power ( not finished yet so i dont know ) but i will guess no more than 35+35 @8R

the problem i noticed is the vbe transitor was never mounted in the heatsink anyway ..
so i will relocate it anyway but anybody has a diferent opinion please let me know ...

regards sakis
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Old 11th February 2010, 08:44 PM   #3
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Hi sakis,

Does it looks like sch below ...it's Cambridge Audio P.50 and I can forward complite service manual for it.
Attached Files
File Type: pdf Cambridge Audio P.50 sch.pdf (96.1 KB, 289 views)
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Old 12th February 2010, 11:13 AM   #4
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thanks for the effort but no !!!

c35 has four outpouts per channel and 2X1 R resistors on each emmiter

so from that i can say no ...

but thanks
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Old 19th February 2010, 09:04 PM   #5
Falcon is offline Falcon  United States
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Default Cambridge P35

Hi:
I am also looking for a schematic of the P35 as well. I was told by Stan Curtis that it had an output of around 45 watts per channel and an unusual phono stage which used fully passive equalization.


Regards,
Mike
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Old 20th February 2010, 06:22 AM   #6
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sorry that is not correct ..at least regarding the phono stage ....

phono stage is active with 2sets of transistors for mc then opamp for mm and the equalization

as about the 45+45W i find it very optimistic ....transformer inside is the size of a donut ...
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Old 20th February 2010, 09:35 AM   #7
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the schematic of the power amp unit from P25 and P35 is very close to that one of Mission Cyrus I and II, if I recall right.
Also Moth (UK) and Monrio (Italy) uses this topology by several of it's models arround 1995 until 1998 in their power amplifier stages (first stage: Darlington-LTP, second stage = predriver: differential amp and current mirror, third stage: PP class A/B power follower/ buffer, sometimes quasi complementary 30-50mA idle current)

Last edited by tiefbassuebertr; 20th February 2010 at 09:40 AM.
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Old 20th February 2010, 09:38 AM   #8
Magura is offline Magura  Denmark
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Quote:
Originally Posted by aparatusonitus View Post
Hi sakis,

Does it looks like sch below ...it's Cambridge Audio P.50 and I can forward complite service manual for it.
Where have you found Cambridge service manuals? I am in need of one for the Azur 340C


Magura
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Old 20th February 2010, 11:17 AM   #9
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Hi Magura,

Sorry, but I don't have it...give me a couple of days and I see if I can get one.
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Old 20th February 2010, 05:26 PM   #10
Falcon is offline Falcon  United States
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Default Cambridge P35

Quote:
Originally Posted by sakis View Post
sorry that is not correct ..at least regarding the phono stage ....

phono stage is active with 2sets of transistors for mc then opamp for mm and the equalization

as about the 45+45W i find it very optimistic ....transformer inside is the size of a donut ...

That is what Stan Curtis told me. He claims that is his design and it was between the P25 and P55. This was also quoted somewhere in the web that it is called "segmented passive equalization".
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