Love that amp and really like seeing these being properly serviced. I am starting the hobby myself and learning from you and a couple others how to do things correctly. Thank you !!
@@VintageAudioFever I would like to know where you are located and if you take outside work. I have a few pieces that I think would make for some good videos. Thanks
@@VintageAudioFeverGood mornin Joe. I have an ADCOM GTP-750 PREAMPLIFIER that does not turn on. And a few pioneers from the 70’s that are starting to make humming noises.
@@JoseVargas-uk3lt Where are you located? Also, I do this in my spare time as I have a full-time job, if you're in No rush especially if I make videos along with it, I find making videos and editing takes me a long time ... But I could look at them and see what we can find... Just curious as what are your 70’s amp?
I still have my SA7500. Bought new in 1975 and it has some problems, it is parked in the attic. I'm going to do something about it because this amplifier is more musical than my current Marantz PM80 or PM17 MK II. If I have to describe the sound of the SA7500, it is velvety, smooth, clear but with a lot of punch.
Its also good looking the amplifier how it looked like back then, im the owner of a SA7800 and it looks and sounds so much better than those cheaply built modern amplifiers with speakers, i even got a 25Year old B&W DM601 just to hear, how better is it, and i was blown off from my chair how good my 45year old amplifier sounds with the DM601.
Quick question: Working on fixing up a similar model. The Speaker and Input selection knobs will not easily pull off. Any quick tips for getting them off without damaging the unit? Other wise great video. Using this as a basis for my project!
Hey....thank you for watching my video. As for your question ⁉️ Yes i use a tack puller and making sure you put something in between your tack puller and the front plate so you don't damage or cuff the facial plate of the receiver.it works wonders for me and use it every time a stubborn knob that won't pull out
Good video Joe. Have this amp, it's working well but need to give it a service as the input selector switch drops stereo and you have to fiddle a bit to get it back. Just some feedback: The audio levels of this video were a little low, which is fine : you just turn up the volume, but then scraping movement and tin dropping noises were very loud (ouch). As was the end of video theme. Something to consider for future videos, an above head or lapel mic should fix that
Hey .. thanks for positive feed back ..I am new with this vidéo/ mic and will be more careful.... About your input selector... I'm wondering if it's just not lose? Maybe take all the knobs off and front plate ... you'll have better access and maybe it's all it needs... Good luck man.
@@VintageAudioFever No problems. The input selector is all nice and tight. I use it for the turntable so when it's always set to that and not being moved its fine, so I haven't done anything about it yet. But thanks for the tips. I've always got your video to come back to, to see how to get into it.
Hi Sir. i'am also a technician here in the philipines and i'm just asking some help if you have spare 100k potentiometer for the volume control ACV-154 Part no.
I do agree with you Frank that 0.05DCV is slightly above , I really wish this SA-7500ii would of had adjustment potentiometer but unfortunately didn't. The cause of this DC offset being so I assume this is probably due to dissimilarities in transistor and due to mismatch in resistor within the circuitry or maybe it is just pioneer wanting it to be but all in all, I think there should be no issues in damaging the speakers....whats your views on this? anything you would of done different? be interesting to heard more from you on this subject. it would be interesting to see if anyone else have the same SA-7500ii to see there DC-offset would be.
@@VintageAudioFever Indeed Joe, ...........several amplifiers don't have adjust for offset ...........if not adjustable , below 20 mV I could live with ............ Any voltage pushes the mechanical resting point of the voice coil out of it's position by a small or larger amount , it also consumes part of the power handling of a speaker . but all is relative ! Yeah the matching of resistors and transistors seems to be an non issue by some ............for the example the Swiss manufacturer of FM acoustics select two transistors out of a badge od thousand ..............wonder why their amplifiers are so expensive and also so well regarded.. Thank you for your videos , .............we all learn one from another , the goal is sharing ...!
thanks Frank...Good Point!!! I will keep the 20mV as a marker reference point. Your obsoletely right about learning from one another. Hope you have a great end of week, looking forwards in your point of views on my future videos 4sure!! best regards Joseph
Hi Marcos I know it may look like I'm scraping the unit when I pick em up or flip em but i assure you I'm not...the camera mic picks up the noise louder that it looks...i have never scratched a audio equipment yet and I've work on a lot of them...i will try to lower the noise from the mic as i realize that it sounds really loud and i apologize about that...thanks for the tip though... I appreciate you watching my video's Jo
Love that amp and really like seeing these being properly serviced. I am starting the hobby myself and learning from you and a couple others how to do things correctly. Thank you !!
very nice. You said it at the end of your video about the nostalgia and learning to keep our vintage gear running. Keep it up!
Very nice work. It’s hard to find anyone that really cares about what they do. Please pick up the good work.
Thank You Jose, I appreciate you taking the time to check my channel...:)
@@VintageAudioFever I would like to know where you are located and if you take outside work. I have a few pieces that I think would make for some good videos. Thanks
@@JoseVargas-uk3lt hi again Jose.
I live in Moncton NB Canada...
What pieces did you have that needs some repairs?
@@VintageAudioFeverGood mornin Joe. I have an ADCOM GTP-750 PREAMPLIFIER that does not turn on. And a few pioneers from the 70’s that are starting to make humming noises.
@@JoseVargas-uk3lt Where are you located?
Also, I do this in my spare time as I have a full-time job, if you're in No rush especially if I make videos along with it, I find making videos and editing takes me a long time ... But I could look at them and see what we can find...
Just curious as what are your 70’s amp?
Regards
Joseph
I still have my SA7500. Bought new in 1975 and it has some problems, it is parked in the attic. I'm going to do something about it because this amplifier is more musical than my current Marantz PM80 or PM17 MK II.
If I have to describe the sound of the SA7500, it is velvety, smooth, clear but with a lot of punch.
Same here. Mine needs a little repair but was a punchy sounding amp considering it's low power.
I had one of these growing up and would like to buy one again
Its also good looking the amplifier how it looked like back then, im the owner of a SA7800 and it looks and sounds so much better than those cheaply built modern amplifiers with speakers, i even got a 25Year old B&W DM601 just to hear, how better is it, and i was blown off from my chair how good my 45year old amplifier sounds with the DM601.
Quick question: Working on fixing up a similar model. The Speaker and Input selection knobs will not easily pull off. Any quick tips for getting them off without damaging the unit? Other wise great video. Using this as a basis for my project!
Hey....thank you for watching my video. As for your question ⁉️
Yes i use a tack puller and making sure you put something in between your tack puller and the front plate so you don't damage or cuff the facial plate of the receiver.it works wonders for me and use it every time a stubborn knob that won't pull out
* just make sure the knobs are not holding in place by a torch screw ...if not then use the tack puller tool
@@VintageAudioFever Thanks for speedy response! Very Helpful
I see that you drag and turn withaout any care Is it a jewel!!!
Good video Joe. Have this amp, it's working well but need to give it a service as the input selector switch drops stereo and you have to fiddle a bit to get it back. Just some feedback: The audio levels of this video were a little low, which is fine : you just turn up the volume, but then scraping movement and tin dropping noises were very loud (ouch). As was the end of video theme. Something to consider for future videos, an above head or lapel mic should fix that
Hey .. thanks for positive feed back ..I am new with this vidéo/ mic and will be more careful....
About your input selector... I'm wondering if it's just not lose? Maybe take all the knobs off and front plate ... you'll have better access and maybe it's all it needs...
Good luck man.
@@VintageAudioFever No problems. The input selector is all nice and tight. I use it for the turntable so when it's always set to that and not being moved its fine, so I haven't done anything about it yet. But thanks for the tips. I've always got your video to come back to, to see how to get into it.
Same problem here, input selector fault.
One channel stops playing sometimes. Move the input selector a bit and the channel comes back.
Saludos desde Venezuela. Me puede decir el nro de los transistores de salida? Gracias. Bonito tutorial excelente.
Did u ever get the transistor numbers?
I have a Pioneer SX-780 in need of the same upgrade, are you still doing that work?
I am yes
Thanks. Where can I buy AC8V50MA and AC6V30MA wired LED lamps?
I buy my lamps at ABRA electronics in Montreal....not sure how far that is from you
transformer how many amperes? and what volume?
Seems generous and well dimensionned as it was practice in the PAST ......
Someone knows the differnce between a mark ll and a non mark ll?
Hi Sir. i'am also a technician here in the philipines and i'm just asking some help if you have spare 100k potentiometer for the volume control ACV-154 Part no.
I don't have spare parts ...sorry!!
Very nice but the intro is much too loud especially compared to your mic.
that was one of my first video....I did buy a microphone since then...
No biggie. Thanks for replying
50 mV offset is indeed acceptable but is not realy good .........
I do agree with you Frank that 0.05DCV is slightly above , I really wish this SA-7500ii would of had adjustment potentiometer but unfortunately didn't.
The cause of this DC offset being so I assume this is probably due to dissimilarities in transistor and due to mismatch in resistor within the circuitry or maybe it is just pioneer wanting it to be but all in all, I think there should be no issues in damaging the speakers....whats your views on this? anything you would of done different? be interesting to heard more from you on this subject.
it would be interesting to see if anyone else have the same SA-7500ii to see there DC-offset would be.
@@VintageAudioFever Indeed Joe, ...........several amplifiers don't have adjust for offset ...........if not adjustable , below 20 mV I could live with ............
Any voltage pushes the mechanical resting point of the voice coil out of it's position by a small or larger amount , it also consumes part of the power handling of a speaker . but all is relative !
Yeah the matching of resistors and transistors seems to be an non issue by some ............for the example the Swiss manufacturer of FM acoustics select two transistors out of a badge od thousand ..............wonder why their amplifiers are so expensive and also so well regarded..
Thank you for your videos , .............we all learn one from another , the goal is sharing ...!
thanks Frank...Good Point!!!
I will keep the 20mV as a marker reference point. Your obsoletely right about learning from one another.
Hope you have a great end of week, looking forwards in your point of views on my future videos 4sure!!
best regards
Joseph
@@VintageAudioFever OK Joseph ,
I love your rotary table.
I need one in my laboratory.
Best Regards.
Your voice is too quiet compared to the opening demo.
You manipulation Is very brutal you must be More careful!!!!!!
Hi Marcos
I know it may look like I'm scraping the unit when I pick em up or flip em but i assure you I'm not...the camera mic picks up the noise louder that it looks...i have never scratched a audio equipment yet and I've work on a lot of them...i will try to lower the noise from the mic as i realize that it sounds really loud and i apologize about that...thanks for the tip though...
I appreciate you watching my video's
Jo
@@VintageAudioFever
Ok Joe i am technician too and very careful...thanks joe