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Old 7th February 2011, 11:21 AM   #1
freebee is offline freebee  France
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Unhappy Sony HA-55 Head Amplifier

I've just bought a Sony HA-55 phono head amp, and there's a problem with the left channel. Somehow the bass is missing and I'm wondering what can cause that in a head amp (there might also be a minor volume difference).

I've got the schematics (and parts list) so I can test if all components are working according to specifications.

Would appreciate however if somebody could point me in the right direction of where to start.

Thanks!
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Old 8th February 2011, 03:40 PM   #2
kevinkr is offline kevinkr  United States
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I would assume given that it is over 30yrs old it is due for full electrolytic cap replacement at minimum..

http://www.thevintageknob.org/SONY/s...HA55/HA55.html

http://translate.google.com/translat...%26prmd%3Divns
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Last edited by kevinkr; 8th February 2011 at 03:45 PM.
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Old 8th February 2011, 05:56 PM   #3
nac134 is offline nac134  Canada
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I second that. Also, it might be a good idea to post the schematic here if you're going to get into it. The quality of advice that can be given rises exponentially once there's a schematic.
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Old 8th February 2011, 06:26 PM   #4
freebee is offline freebee  France
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Any idea how I can upload a PDF file? (schematics)
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Old 8th February 2011, 07:45 PM   #5
freebee is offline freebee  France
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Thanks for the Japanese link Kevin. Great stuff this guy has.
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Old 8th February 2011, 08:14 PM   #6
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by freebee View Post
Any idea how I can upload a PDF file? (schematics)
Or take a screen of the pdf like this and post as a .jpg
Attached Images
File Type: jpg Screen snip.JPG (81.8 KB, 112 views)
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Old 8th February 2011, 08:15 PM   #7
kevinkr is offline kevinkr  United States
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Depending on the size of the pdfs you can just attach them using the "manage attachments" button under advanced editing. I replied to your PM just a little while ago..
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Old 13th February 2011, 09:04 PM   #8
kevinkr is offline kevinkr  United States
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Hi Orson,
Check your email for my response. I believe a cap replacement as stated is in order. Specifics are in my email response.

Good Luck!
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Old 14th February 2011, 10:32 AM   #9
freebee is offline freebee  France
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Default Sony HA-55

Hi Kevin,

Thanks for your advice. Will try to find the right values to replace the Tantalums as well as the Electrolytes.

Kind regards,
Orson
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