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Carlsboro Sidewinder 60Watt All Tube Amplifier.
Carlsboro Sidewinder 60Watt All Tube Amplifier.
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Old 24th March 2019, 05:30 PM   #1
Hi_Q is offline Hi_Q  England
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Default Carlsboro Sidewinder 60Watt All Tube Amplifier.

I had one of these arrive for servicing, no schematics or other data on the internet so this meant reverse engineering and this is a record of how the servicing evolved. This is work in progress as only the power and output board has been done but for those seeking this 'hens teeth' information, well it is a start.

http://www.g4cnh.com/public/Carlsbor..._Amplifier.pdf
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Old 24th March 2019, 07:29 PM   #2
JonSnell Electronic is online now JonSnell Electronic  United Kingdom
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From my service manual. I suspect copyright is out of date now.😁
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File Type: png Sidewinder-squashed.png (264.5 KB, 51 views)
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Old 25th March 2019, 02:26 AM   #3
Hi_Q is offline Hi_Q  England
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That's the hybrid one, the one I have to repair is all tube.
I have managed to reverse engineer the power board, I will tackle the front end circuitry when I have completed testing the power board.
Thanks for the reply, someone with the hybrid will be very grateful.
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File Type: jpg circuit diagram_output board.jpg (426.4 KB, 41 views)
File Type: jpg MAIN BOARD PARTS ID.jpg (226.6 KB, 45 views)
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Old 25th March 2019, 03:43 AM   #4
JMFahey is offline JMFahey  Argentina
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Thanks to both

That said, the schematic posted by Jon Snell is not hybrid at all, signal parth is all tube end to end; Fets are used as audio switches,basically grounding not needed signal to allow selective 2 channel operation.

I bet you will find them once you get to the preamp.

That said, beutiful pictures and step by step troubleshooting
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Old 25th March 2019, 11:51 AM   #5
Hi_Q is offline Hi_Q  England
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Apologies to Jon, the name of the amp fooled me, I can see valves at the front end but yet to remove it and get involved there. At least I won't have to spend time reverse engineering it and can get on with the servicing. Many Thanks Jon, I did receive an e-mail from Carlsboro today stating they have no circuit diagrams for any early equipment.
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Old 25th March 2019, 05:06 PM   #6
Hi_Q is offline Hi_Q  England
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Does anyone have information as to what the bias current should be set to?
I only deal normally with home hi-fi amplifiers where the quiescent current for EL34 output is set to around 35mA. Would this bias level be acceptable to an instrument amplifier or should it be set higher?
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Old 25th March 2019, 05:33 PM   #7
JMFahey is offline JMFahey  Argentina
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It should be fine, but you may verify it by scoping output to see whether you still have a crossover notch/kink or not.

I guess you will not, but it doesn´t hurt checking.
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