Pioneer SX-1250 recap and restoration thread!
- Thread starter mattsd
- Start date
Okay I think I started a new thread at Pioneer Audio titled "The Patient"
xXColdShotXx
Active Member
Part # 667-ECQ-V1H224JL is obsolete on mouser now. Is there an updated Pioneer SX-1250 recap and restoration list of parts for March 2016?
The series is EOL
but there is stock left of other values, such as
667-ECQ-V1H334JL
you did not say exactly what place it is being used
If it is used on the flat amp input to the jfet? no problem increasing its value.
but there is stock left of other values, such as
667-ECQ-V1H334JL
you did not say exactly what place it is being used
If it is used on the flat amp input to the jfet? no problem increasing its value.
mattsd
Super Member
Use 505-MKS20.22/63/5 in place of it, Panasonic phased out pretty much the entire ECQ line below 250VDC sadly.
The protection relay in this list is a 2 pole unit. It should be a 4 pole unit #653-MY4-02DC24
mattsd
Super Member
Whoops, thanks for bringing that to my attention. It has been fixed.
No problem. I was wondering why Mouser kept sending 2 pole relays. I have 4 of them now! I could sure use your help over at my "5590 in protection" thread. I've been trying to figure it out myself but now I am hoisting the white flag. I am stumped
Timmyboy55
New Member
Hi All!
I'm a 22 yo guy with a fascination for old receivers! I picked up my "working" SX-1250 a few months ago, been busy with it since!
Cosmetically it's now as good as it could be.
Technically, not so well
When you let the receiver play, within a few moments it will start to crackle from the left channel, then it will give a loud bang from the left speaker.. somethimes it goes in protection, most times it just continues to play... but it will continue to crackle and then pops and bangs...
I've tested a couple of things already but today I changed the Power Amp boards with eachother and the problem also went to the right instead of left.. so the problem is for sure on the Left (on this moment its right, but I marked it as Left) Power Amplifier board!
I already recapped the 8 aluminium capacitors, so these are brand new.
I also already resoldered all the pins but the exact problem is still here.
So my guess is, there is a component (or more) that's bad right? But I'm not an elecktrician so I really don't know what component could do such a thing?!
My guess is to start replacing the tantal and ceramic capacitors??
Thanks guys, I cant wait to let the beast play
I'm a 22 yo guy with a fascination for old receivers! I picked up my "working" SX-1250 a few months ago, been busy with it since!
Cosmetically it's now as good as it could be.
Technically, not so well
When you let the receiver play, within a few moments it will start to crackle from the left channel, then it will give a loud bang from the left speaker.. somethimes it goes in protection, most times it just continues to play... but it will continue to crackle and then pops and bangs...
I've tested a couple of things already but today I changed the Power Amp boards with eachother and the problem also went to the right instead of left.. so the problem is for sure on the Left (on this moment its right, but I marked it as Left) Power Amplifier board!
I already recapped the 8 aluminium capacitors, so these are brand new.
I also already resoldered all the pins but the exact problem is still here.
So my guess is, there is a component (or more) that's bad right? But I'm not an elecktrician so I really don't know what component could do such a thing?!
My guess is to start replacing the tantal and ceramic capacitors??
Thanks guys, I cant wait to let the beast play
Timmyboy55
New Member
Isnt this a nice addition when I find the problem for peeps that have the same problem as I have?
Otherwise I will open a new thread but I guess this will be a short journey (I hope)
Otherwise I will open a new thread but I guess this will be a short journey (I hope)
petervv
Active Member
hi Timmyboy
>So my guess is, there is a component (or more) that's bad right? But I'm not an elecktrician so I really don't know what component could do such a thing?!
I had the same problem, just replace the transistors on the amp board, problem solved, 'Mark the Fixer' and others have done recommendations for replacements, easy to find using the search function of this forum
regards, Peter
>So my guess is, there is a component (or more) that's bad right? But I'm not an elecktrician so I really don't know what component could do such a thing?!
I had the same problem, just replace the transistors on the amp board, problem solved, 'Mark the Fixer' and others have done recommendations for replacements, easy to find using the search function of this forum
regards, Peter
Timmyboy55
New Member
Ahyes, thanks.. got a pm with the same answer!
Anyone happens to have those 2 transistors left that are gain matched (not looking for 100% perfect matched) so for the 2 boards in total of 4 transistors, and want to ship them to me to The Netherlands, please give me a PM! not looking for rediculous prices!
I'm going to search some more threads on the forum for more information!
Anyone happens to have those 2 transistors left that are gain matched (not looking for 100% perfect matched) so for the 2 boards in total of 4 transistors, and want to ship them to me to The Netherlands, please give me a PM! not looking for rediculous prices!
I'm going to search some more threads on the forum for more information!
Posts 102 and 103 of this thread is the "List" for the sx-1250.
It's nice to gain match the 992's but not necessary as the trimmer makes up the difference.
The set has several problematic transistors that should be replaced. And a few other maintenance issues that should be addressed.
You might order components for the other boards making the shipping worth while. The set is fairly easy to work and with the modular boards you can take your time and enjoy the receiver between maintenance sessions.
And yes, Please start your own "Thread". The members love a good sx-1250 story.
Oh, and Welcome!
It's nice to gain match the 992's but not necessary as the trimmer makes up the difference.
The set has several problematic transistors that should be replaced. And a few other maintenance issues that should be addressed.
You might order components for the other boards making the shipping worth while. The set is fairly easy to work and with the modular boards you can take your time and enjoy the receiver between maintenance sessions.
And yes, Please start your own "Thread". The members love a good sx-1250 story.
Oh, and Welcome!
Timmyboy55
New Member
Thanks! and I will make a new thread when I got some time 
With Farnell I can order without shipping costs, so I could even order 1 component of 1 cent haha
With Farnell I can order without shipping costs, so I could even order 1 component of 1 cent haha
petervv
Active Member
Thanks! and I will make a new thread when I got some time
With Farnell I can order without shipping costs, so I could even order 1 component of 1 cent haha
I think I've got about 40 pieces of 992's left and I can do a first order matching using the Hfe measurement of my my digital multimeter.
I'm also in the Netherlands so shipping is cheap.
(I once measured all 40 and differences were very small, I wouldn't hesitate to use unmatched sets as long as they are from the same production batch)
Let me know if you want me to send you some matched sets.
kind regards, Peter
Timmyboy55
New Member
Hi Peter!
Much thanks!
But too late! I already ordered 10 transistors:
http://nl.farnell.com/fairchild-semiconductor/ksa992fbu/trans-bipol-pnp-120v-to-226aa/dp/2453942
They should be fine if not I will contact you for them! Also ordered 2 tantalum caps and 4 trimmers
Much thanks!
But too late!
I already ordered 10 transistors:http://nl.farnell.com/fairchild-semiconductor/ksa992fbu/trans-bipol-pnp-120v-to-226aa/dp/2453942
They should be fine
if not I will contact you for them! Also ordered 2 tantalum caps and 4 trimmers
petervv
Active Member
Hi Peter!
Much thanks!
But too late!
http://nl.farnell.com/fairchild-semiconductor/ksa992fbu/trans-bipol-pnp-120v-to-226aa/dp/2453942
They should be fine
>I already ordered 10 transistors:
No problem
>Also ordered 2 tantalum
Most people replace the tantalum with a standard electrolitic or (for small values) a film capacitor, tantalum's have a bad rep for reliability
have a nice weekend, Peter
Timmyboy55
New Member
Admin please delete
And maybe delete the other ones if not handy
And maybe delete the other ones if not handy
Last edited:
Agree with TSd71.
Most folks who start a "rebuild" thread, like to keep it about their gear. AK has become a great place to document builds, as well as get info.
Kind Regards,
John
Most folks who start a "rebuild" thread, like to keep it about their gear. AK has become a great place to document builds, as well as get info.
Kind Regards,
John