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CAudio SR808 |
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pscstudio54 
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Joined: 14 March 2020 Location: Bridgwater Status: Offline Points: 12 |
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 Posted: 15 March 2020 at 12:23pm |
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That's everything I need to know. Thank you. I have to admit it, it does sound really good.
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APC321
Young Croc 
Joined: 24 August 2013 Location: West Midlands Status: Offline Points: 684 |
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Posted: 15 March 2020 at 4:20pm |
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simonp1100
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Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1110 |
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Posted: 15 March 2020 at 4:54pm |
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That looks like it's from the Avitec catalogue as i have an original one still in very good condition.
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APC321
Young Croc
Joined: 24 August 2013 Location: West Midlands Status: Offline Points: 684 |
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Posted: 15 March 2020 at 5:24pm |
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Yes 1986. Well spotted Simon!
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simonp1100
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Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1110 |
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Posted: 15 March 2020 at 5:31pm |
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My catalogue is the 1989 version and has the Beta Pro amplifiers (220,500 & the 800) which were also built by C-Audio. Happy days.
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kedwardsleisure
Old Croc 
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947 |
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Posted: 15 March 2020 at 6:18pm |
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1986 was a notable year in many ways. C-Audio launched the SR808, Peugeot launched the 309, Fergie and Prince Andrew got married and the Space Shuttle blew up shortly after launch.
Oh and I left school that year. 
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Kevin
North Staffordshire |
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studio45
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Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3864 |
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Posted: 16 March 2020 at 5:00pm |
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There are white versions? OOOOOH never seen one in the wild!
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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kedwardsleisure
Old Croc
Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947 |
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Posted: 17 March 2020 at 10:55am |
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That's the load testing done, just a slight problem with one channel which was clipping assymetrically, caused by one of the VI clamp diodes being cut out of circuit for some reason.
I always like to do an audio test with music contemporary to the amp in question. In this case, I'm playing Whitney Houston. 
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Kevin
North Staffordshire |
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totalAudio
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Joined: 29 October 2015 Status: Offline Points: 27 |
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Posted: 19 April 2020 at 10:52am |
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you guys seem like you might be able to help me out :D
I have three sr707 currently and one of them just started giving me major troubles :S the peak limiter lights are coming on very quickly with little signal or gain im guessing (with limited knowledge) that a power cap or two may have started to run dry given the age and unknown service history on these can anyone suggest a way of getting to the root of the issue? willing to put my hand to it myself with some guidance cheers for any help guys |
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simonp1100
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Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1110 |
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Posted: 19 April 2020 at 11:08am |
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"im guessing (with limited knowledge) that a power cap or two may have started to run dry given the age and unknown service history on these"
I doubt that the power caps are running dry. Check the below first:-- 1. Each driver PCB board check R14 & R50 (were 24K 1/2 Watt now changed to 27K 1 Watt), these tend to go open / high resistance if the value in your amplifiers are 24K (Maybe change these in ALL yor amplifiers) 2. Are BOTH peak lights doing this on both channels or just one channel ?. Please also be careful as there is high voltages around and the above MUST be done by a engineer or someone who knows about power amplifiers. 
Edited by simonp1100 - 19 April 2020 at 11:10am |
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totalAudio
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Posted: 19 April 2020 at 12:00pm |
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I will check this out ill get one opened up today
and it is both channels that are doing this one slightly more so then the other id say but that could just be the difference in the peak light, both channels are about the same audibly thanks simon |
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simonp1100
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Joined: 01 September 2008 Location: Bristol Status: Offline Points: 1110 |
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Posted: 19 April 2020 at 12:33pm |
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Hi, Each amplifier driver board controls ONE channel and has the following circuits on it---.
1. Amplifier driver stage. 2. Peak light driver circuit. 3. Balanced input op-amp driver. 4. Protection circuit (but this is normally only used on ONE board). So if BOTH channels are doing then it could be one of the following---. 1. Check input connections (i.e. are you using balanced or unbalanced connections). 2. Resistors as montioned in previous reply could be faulty on BOTH channel PCB boards. This would need checking and also updating on any other SR amplifiers you have (24K To 27K 1 Watt) 3. The soft start relays is stuck and amplifier is still in "Soft Start Mode" i.e. the 50 ohm soft start resistor has'nt been shorted out by the relay and this in turn will give you a 50 ohm resistor in series with the main power transformer and will reduce power output.
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