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Old 20th June 2010, 11:19 AM   #1
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Default Help! Rotel rb1080 bias setting

Can anyone tell me what is recommended bias voltage for Rotel RB1080?
Thanx in advance.
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Old 20th June 2010, 12:03 PM   #2
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adjust VR 601 while monitoring voltage between TP1 and TP3 for 7 mv (millivolt ) reading for one chanel

adjust vr 602 while monitoring voltage between TP2 and TP4 for 7 mv ( millivolt ) reading for the other chanel

regards sakis ( information for the available service manual )
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Old 20th June 2010, 12:29 PM   #3
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Hi Sakis, wrong thread etc. but RA 1060 Rotel - similar? There's no urgency, its an old job never completed.
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Old 20th June 2010, 12:46 PM   #4
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Quote:
Originally Posted by Ian Finch View Post
Hi Sakis, wrong thread etc. but RA 1060 Rotel - similar? There's no urgency, its an old job never completed.
sure Ian ....what can i do for you ??? service manual or adjustment procedures ??
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Old 20th June 2010, 12:52 PM   #5
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Wow, that was quick, quick service hehe.
It was the bias setting which I stupidly didn't check for before replacing output Txs.
I thought you may have had this one in the file for RB1080 too. thks
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Old 20th June 2010, 12:58 PM   #6
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well Ian its not the exact same thing ...see attachment please that is a part of the service manual ... ( e mail me i f you want it ) ( for the 1060 ...its not in the same file with 1080 works diferent )

kind regards sakis
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File Type: jpg rotel.JPG (83.1 KB, 116 views)
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Last edited by east electronics; 20th June 2010 at 01:01 PM.
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Old 20th June 2010, 01:14 PM   #7
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I think with those figures and warm-up note it should be fine thank you very much, Sakis. I had presumed 12mv and now I know better. Thank you too for the offer of manual details. Can I offer you a beer or would you like something better?
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Old 20th June 2010, 01:21 PM   #8
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i am fine Ian thanks....i would be actually tempted to listen to it either way 5 or 12 mv and for sure it will run hotter with a bit nore bias ....

often if i service amps that are supposed to used from normal people and no party animals i try to keep that bias up ( up means to a reasonable up )

kind regards sakis
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Old 20th June 2010, 01:31 PM   #9
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just been looking at the schematic of the 1080 and i ve seen that is a 200w very symmetric and inetersting amplifier but still doesnt use any vi limmiter for the output section nice approach for a hifi machine but not really safe for this ammount of power ...

if the power supply is good that design will easilly produce 200w at 8R and almost double at 4 ( even though specs say 300 and that is not really possible without any limmiting )

so either the supply is poor or the estimation is academic

still remains an interesting amplifier
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Old 21st June 2010, 09:39 PM   #10
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Default Thank you

Quote:
Originally Posted by sakis View Post
adjust VR 601 while monitoring voltage between TP1 and TP3 for 7 mv (millivolt ) reading for one chanel

adjust vr 602 while monitoring voltage between TP2 and TP4 for 7 mv ( millivolt ) reading for the other chanel

regards sakis ( information for the available service manual )
Thank you for your quick reply.
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