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#1
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Toshiba sa-500 receiver
I was recommended to go here by rusty . I am new to vintage audio,
and recently got a toshiba sa-500. It has a pretty bad balance issue. I have to turn the knob to 3 on the right for it to be balanced. Any solutions? |
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#2
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Toshiba sa-500 receiver
On Tue, 8 Jul 2008 20:34:35 -0700 (PDT), carfreak
wrote: I was recommended to go here by rusty . I am new to vintage audio, and recently got a toshiba sa-500. It has a pretty bad balance issue. I have to turn the knob to 3 on the right for it to be balanced. Any solutions? snip First, swap the speaker leads and see if the trouble follows the speaker. You may have a loudspeaker issue, not an electrical issue. If the trouble doesn't follow the speaker, you could have a number of different problems, a likely one being a toasted output transistor, which would make the channel in question about 6 dB less loud than the good one. You don't say if the affected channel has a distortion problem or not, which could alos be an indicator. These weren't very good units, so don't go spending a lot of money fixing it. Toshiba's audio products were, around that time, discount store stuff at best. Their cassette decks were some of the worst I've ever seen at any price. |
#3
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Toshiba sa-500 receiver
On Jul 9, 1:22 pm, DeserTBoB wrote:
On Tue, 8 Jul 2008 20:34:35 -0700 (PDT), carfreak wrote: I was recommended to go here by rusty . I am new to vintage audio, and recently got a toshiba sa-500. It has a pretty bad balance issue. I have to turn the knob to 3 on the right for it to be balanced. Any solutions? snip First, swap the speaker leads and see if the trouble follows the speaker. You may have a loudspeaker issue, not an electrical issue. If the trouble doesn't follow the speaker, you could have a number of different problems, a likely one being a toasted output transistor, which would make the channel in question about 6 dB less loud than the good one. You don't say if the affected channel has a distortion problem or not, which could alos be an indicator. These weren't very good units, so don't go spending a lot of money fixing it. Toshiba's audio products were, around that time, discount store stuff at best. Their cassette decks were some of the worst I've ever seen at any price. we did switch the speaker leads. that was the first thing we did. the speaker was not the issue. the receiver has a lot of sentimental value to my friend it belonged to his grandparents. how hard is it to switch out the output transistor? Rusty |
#4
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Toshiba sa-500 receiver
On Wed, 9 Jul 2008 14:20:57 -0700 (PDT), Rusty
wrote: we did switch the speaker leads. that was the first thing we did. the speaker was not the issue. the receiver has a lot of sentimental value to my friend it belonged to his grandparents. how hard is it to switch out the output transistor? snip OK, this unit (I believe) has a speaker selection switch. Try running from the "B" speaker terminals and see if the problem still stays the same. Replacing a standard TO3-case output transistor is quick work, but first you have to know how to find the bad one. Tools would be a soldering iron, thermal grease and normal screwdrivers, side cutters, et al. I really don't have the JEDEC number of the original outputs on those handy, but suffice it to say that, if failed, the bad transistor won't be shorted, since the amplifier is still operating. I'd look for oxidized connections on the output transistor heat sink. Also, be aware that Japanese electronics from this era were well known for developing cracked solder on their wave-soldiered PC boards, but I don't think that's the issue here. |
#5
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Toshiba sa-500 receiver
On Jul 9, 5:14*pm, DeserTBoB wrote:
On Wed, 9 Jul 2008 14:20:57 -0700 (PDT), Rusty wrote: we did switch the speaker leads. that was the first thing we did. the speaker was not the issue. the receiver has a lot of sentimental value to my friend it belonged to his grandparents. how hard is it to switch out the output transistor? snip OK, this unit (I believe) has a speaker selection switch. *Try running from the "B" speaker terminals and see if the problem still stays the same. Replacing a standard TO3-case output transistor is quick work, but first you have to know how to find the bad one. *Tools would be a soldering iron, thermal grease and normal screwdrivers, side cutters, et al. *I really don't have the JEDEC number of the original outputs on those handy, but suffice it to say that, if failed, the bad transistor won't be shorted, since the amplifier is still operating. I'd look for oxidized connections on the output transistor heat sink. Also, be aware that Japanese electronics from this era were well known for developing cracked solder on their wave-soldiered PC boards, but I don't think that's the issue here. My receiver hasn't been used in probably over a decade, so oxidation is very possible. I will check it out, thanks for the advice. If I do find oxidation, how should I clean it? |
#6
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Toshiba sa-500 receiver
On Wed, 9 Jul 2008 21:52:35 -0700 (PDT), carfreak
wrote: My receiver hasn't been used in probably over a decade, so oxidation is very possible. I will check it out, thanks for the advice. If I do find oxidation, how should I clean it? snip On wafer switches, the best first aid is simply exercising them. For noisy switches and pots, a switch contact cleaning spray, notably those from Caig Laboratories (Caig Pro Gold is a favorite of mine), is best, but don't overdo it. Washing potentiometers and switches too much will wash out all the "pot grease" and the oxidation will return shortly, along with erratic performance. Also of concern, if the unit has been sitting around unenergized, is the condition of any electrolytic capacitors in the unit. Usually, this will manifest itself in "crackling and popping" noises, if the power supply electrolytics are bad. Most of the older Japanese receivers of this ilk used Nichicon axial electrolytics in for stage decoupling, and they do tend to go bad. Job 1 right now, though, is tracking down why one channel is performing badly. Good luck with that. |
#7
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Toshiba sa-500 receiver
My receiver hasn't been used in probably over a decade, so oxidation
is very possible. *I will check it out, thanks for the advice. *If I do find oxidation, how should I clean it?- Hide quoted text - - Show quoted text - carfreak check your email, I sent you one |
#8
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Toshiba sa-500 receiver
On Thu, 10 Jul 2008 12:13:43 -0700 (PDT), "Dishwasher Charlie" Nudo,
Drums, PA aka trippin-2-8-track wrote: My receiver hasn't been used in probably over a decade, so oxidation is very possible. *I will check it out, thanks for the advice. *If I do find oxidation, how should I clean it?- Hide quoted text - - Show quoted text - carfreak check your email, I sent you one snip Why do you have to "announce" that you sent someone an email, if but only to say that you've sent yet another lie-filled attack against me to him? Do you think you're fooling anyone with your crap? No one is fooled. The only "fool" here is "Dishwasher Charlie" Nudo, the simpleton from Drums. |
#9
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Toshiba sa-500 receiver
On Jul 10, 5:04*pm, DeserTBoB wrote:
On Thu, 10 Jul 2008 12:13:43 -0700 (PDT), "Dishwasher Charlie" Nudo, Drums, PA *aka trippin-2-8-track wrote: My receiver hasn't been used in probably over a decade, so oxidation is very possible. *I will check it out, thanks for the advice. *If I do find oxidation, how should I clean it?- Hide quoted text - - Show quoted text - carfreak check your email, I sent you one snip Why do you have to "announce" that you sent someone an email, if but only to say that you've sent yet another lie-filled attack against me to him? *Do you think you're fooling anyone with your crap? *No one is fooled. *The only "fool" here is "Dishwasher Charlie" Nudo, the simpleton from Drums. sorry to ruin your fun, desertbob, but it wasnt what you think. it was advice along with an offer to repair my receiver for a cost. |
#10
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Toshiba sa-500 receiver
On Thu, 10 Jul 2008 18:44:55 -0700 (PDT), carfreak
wrote: sorry to ruin your fun, desertbob, but it wasnt what you think. it was advice along with an offer to repair my receiver for a cost. snip Usually, he sends diatribes to others about his "enemies," as people send me the mail they get from him. Consider yourself lucky in that regard, but this guy Charlie Nudo is NO electronics technician. What the game is with Noodles is that he's hooked in with the owner of a dying electronics shop in Hazelton, PA. Noodles takes your unit to him, has the dude repair it, and then tacks on his take on top of it. You'd be far better off taking it to someone local to you...assuming you can find one. Even if you go for online repair, better to send the unit directly to this guy's shop rather than go through our resident scumbag. |
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