Interesting repair video on the little Pioneer. The SX-434 was my first "component" receiver in 1975, it was swell. All the basic features for quality sound and "thrusting" 15wpc, it was quite good for a small apartment with efficient speakers. Gotta love that mid '70's blue back lit dial scale and red STEREO lamp. It just oozes nostalgia. I currently use an SX-434 in my 900+ cu/ft kitchen system. It powers a Nakamichi BX-1 cassette deck and two pairs of speakers; Synergistics S12B and Boston Acoustics A-40's. The SX-434 easily drives a 4 ohm load. Nice looks and a heavy sucker weighing in at nearly 20 lbs, it's freakin' boss.
@@ChasLarge- still though, that these SX-434 receivers are nearing the fifty year old mark I think they still perform quite well if kept in good working order. Even in an averaged size room, used with efficient speakers, if you keep the volume reasonable the SX-434 can be very satisfying. All it needs is a strobe, lava lamp and black light, fuhgeddaboudit.
I repaired one similar for a girlfriend in the mid 80's. it had a power board on the top in the middle behind the display and a power regulator transistor [TO-220] that developed a cold solder joint on one of the legs.
Hi , i have Pioneer SX 434 but the "stereo" light bulb doesn't work. The light bulb is not faulty. I don't hear stereo sound but mono in FM. It could be HA1156 ? what do you say? Thank you. Sam
It is possible, have you checked the working voltages? Do you get a strong signal on the meter for an FM stereo station? I would be inclined to check the primary rf amplifier transistors like the one I found in the video, they can go low gain.
Hi i've brought a pioneer SX 434 working FM and AM both speakers working fine but only left speaker working when switching to phono for turntable any idea thanks
Hi Chas, I've got one of these and the R channel (on both Phono and AUX settings) has become distorted (especially with an increase in volume)... L channel fine .... I've tried swapping out cables and speakers - but problem still persisting on R channel - any ideas? I've tried pressing Tape Monitor switch in and out a few times to clean pod - but again - no luck! Cheers!
ODD. The inputs all go through the FUNCTION Switch, so I would have expected the Radio to be affected in the same way. Have you cleaned / deoxified the function switch contacts? Check for loose wires there too.
Interesting repair video on the little Pioneer. The SX-434 was my first "component" receiver in 1975, it was swell. All the basic features for quality sound and "thrusting" 15wpc, it was quite good for a small apartment with efficient speakers. Gotta love that mid '70's blue back lit dial scale and red STEREO lamp. It just oozes nostalgia. I currently use an SX-434 in my 900+ cu/ft kitchen system. It powers a Nakamichi BX-1 cassette deck and two pairs of speakers; Synergistics S12B and Boston Acoustics A-40's. The SX-434 easily drives a 4 ohm load. Nice looks and a heavy sucker weighing in at nearly 20 lbs, it's freakin' boss.
Yes, a nice little amp. In fact, it bounced back after being sold as one of the PHONO Pre-amp transistors had failed.
@@ChasLarge- still though, that these SX-434 receivers are nearing the fifty year old mark I think they still perform quite well if kept in good working order. Even in an averaged size room, used with efficient speakers, if you keep the volume reasonable the SX-434 can be very satisfying. All it needs is a strobe, lava lamp and black light, fuhgeddaboudit.
had one like that in the 80's, i had a very good FM receiver
The FM receiver in this model were very good, being passive components all in metal cans.
I repaired one similar for a girlfriend in the mid 80's. it had a power board on the top in the middle behind the display and a power regulator transistor [TO-220] that developed a cold solder joint on one of the legs.
Yeah, DJ's were common in these earlier PCBs, soldered by passing the board over a hot bath of solder.
Hi , i have Pioneer SX 434 but the "stereo" light bulb doesn't work. The light bulb is not faulty. I don't hear stereo sound but mono in FM. It could be HA1156 ? what do you say? Thank you. Sam
It is possible, have you checked the working voltages? Do you get a strong signal on the meter for an FM stereo station? I would be inclined to check the primary rf amplifier transistors like the one I found in the video, they can go low gain.
@@ChasLarge Ok , yes I get a strong signal on the meter FM. I need to control the tensions better...Thank you. I hope to let you know news
@@ChasLarge I replaced the HA1156 integrated circuit and the stereo works! ok thanks
Hi i've brought a pioneer SX 434 working FM and AM both speakers working fine but only left speaker working when switching to phono for turntable any idea thanks
Mode selector switch contacts.
Thanks for the reply back i'll clean contact's i've also going to replace bulbs one of them has blown
Hi Chas, I've got one of these and the R channel (on both Phono and AUX settings) has become distorted (especially with an increase in volume)... L channel fine .... I've tried swapping out cables and speakers - but problem still persisting on R channel - any ideas? I've tried pressing Tape Monitor switch in and out a few times to clean pod - but again - no luck! Cheers!
Is it distorted on the Radio as well?
From what I can pick up on AM it doesn't seem to affect radio@@ChasLarge
ODD. The inputs all go through the FUNCTION Switch, so I would have expected the Radio to be affected in the same way. Have you cleaned / deoxified the function switch contacts? Check for loose wires there too.
I'll open it up tonight and have a look tonight - though I am a complete novice! Is there a way I can share a video with you of the audio?@@ChasLarge
@@norfenden you can email it to me: contact@cil-electronics.co.uk