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New member Username: RuggeriPost Number: 1 Registered: Oct-06 | Hi! First post! I have a very old (1976) receiver: a Pioneer SX-750. It seems to be in fine shape, except for one thing. It has what sounds to be 120 cycle hum, even though _nothing is plugged in_. It's in both channels, and you can hear it from the headphone jack just listening to AM or FM radio (and also if you set it to the inputs, even with nothing plugged in). As mentioned, it sounds like 120 cycle noise, but it also doesn't increase with volume (or attenuate either). I don't get it from either of the cassette deck out plugs. Any thoughts?! I'm desperate! -- Ned Ruggeri |
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Gold Member Username: Jan_b_vigneDallas, TX Post Number: 9207 Registered: May-04 | . After thirty years, the caps are starting to go bad. You can replace the caps, if you can find anyone willing to work on such an old unit. But, for the money spent repairing an older amplifier, you might want to look at replacement. If you are interested in repair, and cannot find anyone local to work on the unit, you can place "Vintage audio repair" in search engine. Such services are typically not cheap since you are asking the technician to get tied down to a unit where other problems might surface after the repair. A sometimes forum member called Kegger has been doing some vintage repair. You can find his profile here, https://www.ecoustics.com/cgi-bin/bbs/board-profile.pl?action=view_profile&prof ile=kegger-users. Send him a personal message to ask about repairs. . |
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Bronze Member Username: JawPost Number: 52 Registered: Mar-06 | Thanks for the info. You're welcome. Oy. |
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Silver Member Username: GamerdudeOntario Canada Post Number: 226 Registered: Apr-06 | What a weird back panel |
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Bronze Member Username: Stevestar99Dahlonega, GA Post Number: 22 Registered: Nov-06 | I use to be a tech at a factory authorized service center back in mid 70s and was thing about doing some vintage work on the side. The only problem I've run into is the shipping charges on the the equipment is petty hefty. It's over a $1.00 per pound each way. If $100 to $150 in shipping charges doesn't scare you off, plus $100 for the repair. PM me I might be able to help you. |