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Bugera 333XL schematic
Bugera 333XL schematic
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Old 24th June 2019, 12:31 PM   #1
Carlosraj is offline Carlosraj  United Kingdom
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Default Bugera 333XL schematic

Hi


Does anyone has a schematic for this amp. I need to set the bias. At the bias set point, there is a switch which is selectable between EL34 and 6L6.



Please assist.


Thanks
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Old 24th June 2019, 12:47 PM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Is this the older type or the infinium?
The infinium is self biasing, assuming the correct valves are selected with the switch. All the switch does is add a 5k6 resistor to the bias chain.
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Old 24th June 2019, 01:38 PM   #3
Tesla88 is offline Tesla88  Italy
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Schematic here:
Schematics

I own the 333 non XL version, if you buy the Bugera matched tubes, they come with a letter printed on the octal base, justconnect a voltmeter to the RCA Cinch socket, set the switch to EL34 or 6L6GC, set the trimmer according to the table below

https://www.bax-shop.nl/downloads/do...ersterkers.pdf
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Old 24th June 2019, 01:48 PM   #4
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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There is an error on the valve listing; an EL34 is not a 6550A! It is a 6CA7.
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Old 25th June 2019, 08:56 AM   #5
Carlosraj is offline Carlosraj  United Kingdom
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Thanks alot guys for your info and assistance. I do not know what version this amp is but it has a tube selector switch and a trim pot for bias.
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Old 25th June 2019, 09:42 AM   #6
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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I always, if the customer doesn't want to pay for graded Bugera valves, measure the current drawn on balanced output valves. Look for about 45% dissipation to run moderately cool.
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Old 25th June 2019, 11:09 AM   #7
Carlosraj is offline Carlosraj  United Kingdom
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OK, will do, Thanks
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