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Sugden original A21 preamp voltage?
Sugden original A21 preamp voltage?
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Old 29th June 2020, 02:11 PM   #1
dixikatt is offline dixikatt
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Default Sugden original A21 preamp voltage?

Does anybody know what voltage feeds the preamplifier in the original Sugden A21. The power supply has been altered by a previous owner so I have to sort it out to get it working again after a rectifier failure.
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Old 29th June 2020, 03:07 PM   #2
duncan2 is online now duncan2  United Kingdom
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How original its goes back a long way IE-1968 ?


Scroll down for spec.
Sugden A21 Series 2 amplifier | Hi-Fi News

Last edited by duncan2; 29th June 2020 at 03:10 PM.
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Old 29th June 2020, 09:07 PM   #3
dixikatt is offline dixikatt
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To be more specific, it is the Series 2 model
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Old 29th June 2020, 09:25 PM   #4
duncan2 is online now duncan2  United Kingdom
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That being the case MM=2.5mv. into 68Kohms ? SN 70db down

Radio/Tape/Aux/=150mv into 200Kohms--SN 80db down
Ceramic=50mv


FR=+/- 1db --- 30hz to 20Khz



Thats the ORIGINAL model in my link.
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Old 29th June 2020, 09:38 PM   #5
dixikatt is offline dixikatt
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I'm sorry not being specific enough, I mean the power supply voltage for the preamp.
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Old 29th June 2020, 10:16 PM   #6
OldDIY is offline OldDIY
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Up 32 V Облако Mail.ru - облачное хранилище файлов
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Old 29th June 2020, 11:08 PM   #7
JMFahey is offline JMFahey  Argentina
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Thanks for posting but I can only see a Cyrillic written page which is probably telling I have no business being there

Canīt you just post that image here, so it opens inside the answer itself?

Thanks.
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Old 30th June 2020, 04:22 AM   #8
OldDIY is offline OldDIY
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Supplies to a preamplifier, if required, are taken from the 36 V rails and stabilised to 16 V with the Zener
diode. The zener diode also has in parallel a 1,000 uF capacitor to provide additional ripple smoothing.
https://sound-au.com/tcaas/sugden10w.gif
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Old 30th June 2020, 06:51 AM   #9
OldDIY is offline OldDIY
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Option Richard Allan A21
Richard Allan Class A amplifiers
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Old 30th June 2020, 10:24 AM   #10
dixikatt is offline dixikatt
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So it is 16v, thanks for your contributions.
 

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