What should be done as part of an "Inspection & Service" for an amplifier?

This was what I wrote about the amp in question. You can tell me if I'm painting myself as a fraud:

I have for sale a DH-500 power amp in great condition. It's rated for 255wpc, although I have seen testers achieve more than 400wpc before the onset of clipping. I do not have the equipment to drive it to it's full capability, but I have been running a continious loop of heavy metal through it driving my most demanding speakers and it hardly broke a sweat.

I've opened it up and blown out all the cobwebs. I replaced some case standoffs that had fallen off the heatsink and transformer, and added a bit of oil to the fan mechanism. I also replaced the aging tin RCA jacks with new gold-plated jacks, which provide a better mechanical connection. I left the original binding posts, as they seem to be in good condition. I can replace those with gold ones if you would like.

I've set the bias at 350mA to provide a solid Class A region, and set the DC offset. Everything seems stable.
There are some scratches on the top case, and on the front panel where it was rack mounted. I bent the "wings" back into position as they were slightly off. I also replaced the worn screws on the chassis, and the feet.

The fan makes some slight vibration noises, which vary over time, and will change if you give the case a sharp "smack". I don't think there is much I could do to calibrate it better, and anything I did might well be undone in shipping anyway. It's not audible when in use, of course.
 
Earlier described standard service is a clean up job, visual inspection, switches and pots lubed, and a sound check, maybe a power supply voltage check to satisfy yourself.
The moment you say you checked the voltage, outputs and so on, the whole thing has legal implications, from the quality of meters to your ability.


Your choice, we are all saying don't shoot yourself in the foot.
If you do, don't tell us about it.
 
Earlier described standard service is a clean up job, visual inspection, switches and pots lubed, and a sound check, maybe a power supply voltage check to satisfy yourself.

Perfect, that's exactly what I did.

The moment you say you checked the voltage, the whole thing has legal implications, from the quality of meters to your ability.

No, it doesn't. Not in the US anyway. If the thing arrives and it isn't as described, they can open a claim with PayPal, or ask for a return. But they can't sue me. I'm selling a good as-is, and they are buying it as such. I guess in India things are different? I understand if I was pretending to be certified, but I'm not.
 
If its not, they can request a return. Or ask for their money back. Why would they pay hundreds or thousands of dollars to hire a lawyer when the remedy is simply to get their money back? It's a transaction of goods, not services rendered. You either don't understand what I'm talking about, or you don't understand US law.
 
I'm not saying that I don't believe I have any responsibility for anything. Far from it. But that's not the way the law works. There is no guarantee of performance when you buy something from a private seller. If I buy a car from you and the wheels fall off, I can't sue you unless you deliberately mislead me about the wheels. It's my responsibility to have the car inspected at a reputable shop before I buy it, and if I don't, that's on me.
 
Are you that sure?

Screw what a Canadian, an Indian, and a Swiss tech have to say about morality or what you should or shouldn't do in terms of your time and an amplifier that currently belongs to you.

Then I'm sure that the first time after you bought an Amp over the internet for some price and it don't matter how much it is and where it comes from and you had to pay say 150 bucks for shipment, and you are all excited to get that part, never believing that the seller messed up YOUR GOODS before he sold it, exactly that time you will change your mind.

If something is sold in working condition, then it should be that way. Period, and not messed with it. Clear?

The main reason there is sold so much junk on the internet just to get a few more bucks out of that Junk.

We did not Accuse SoaDMTGguy in any WAY!!!
Myself actually as all other guys tried to explain what is need and what not.
That's all. Do you need some addresses in the USA where you can buy JUNK advertised as Controlled Serviced, in working condition, there are hundreds on EBAY and what EBAY does, when it's a fraud? Nothing!

You are able to send the item back to the seller, he will return you the money, but you have to pay return shipment. And that's OK with you? Good, but not for me. Why not? Because he sold the JUNK and not Technician Certified Serviced and Controlled in Working Condition, as it was stated in the advertisement.!
Because the seller was the guy who cheated..
has nothing todo with morality has something todo with decency.
Does there ring a bell somewhere?
This is it what's all about.
 
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hadley,
In your post, #61, you have shown how morally bankrupt you are.

You are certainly part of the problem. I think both you and SoaDMTGguy are more concerned with what you can get away with rather than what is right and wrong. If you people represent young adults, we are in serious trouble.

Consider that maybe this web site is probably not where you belong.

-Chris
 
Then I'm sure that the first time after you bought an Amp over the internet for some price and it don't matter how much it is and where it comes from and you had to pay say 150 bucks for shipment, and you are all excited to get that part, never believing that the seller messed up YOUR GOODS before he sold it, exactly that time you will change your mind.

If something is sold in working condition, then it should be that way. Period, and not messed with it. Clear?

The main reason there is sold so much junk on the internet just to get a few more bucks out of that Junk.

We did not Accuse SoaDMTGguy in any WAY!!!
Myself actually as all other guys tried to explain what is need and what not.
That's all. Do you need some addresses in the USA where you can buy JUNK advertised as Controlled Serviced, in working condition, there are hundreds on EBAY and what EBAY does, when it's a fraud? Nothing!

You are able to send the item back to the seller, he will return you the money, but you have to pay return shipment. And that's OK with you? Good, but not for me. Why not? Because he sold the JUNK and not Technician Certified Serviced and Controlled in Working Condition, as it was stated in the advertisement.!
Because the seller was the guy who cheated..
has nothing todo with morality has something todo with decency.
Does there ring a bell somewhere?
This is it what's all about.

You're doing here exactly what you've done the entire thread - be hysterical and not really say much of anything related to the original question. You're making huge jumps here by assuming any work the original poster will do will make the amplifier worse or not function. You are projecting your past bad experiences on someone who came here to ask a simple question.

It is simple enough to replace one part for another part, especially capacitors. It is unlikely the amplifier will be worse off for doing that work if time and care is taken.
 
hadley,
In your post, #61, you have shown how morally bankrupt you are.

You are certainly part of the problem. I think both you and SoaDMTGguy are more concerned with what you can get away with rather than what is right and wrong. If you people represent young adults, we are in serious trouble.

Consider that maybe this web site is probably not where you belong.

-Chris

Legally, an item can be sold as-is but that doesn't make it an honest way of doing business if the seller knows more than they're disclosing which I clarified further down in post #61.

There's nothing "morally bankrupt" about clarifying the law in CA and where caveat emptor still applies.

That being said, please look at the thread I created here and then let me know if you still think I'm concerned with what I "can get away with".

I've never sold an item I've restored. The economics make no sense. I could never get the amount of effort I put in back out again.
 
Did you just use the wrong account for this post?

I made this account to make a thread about my two Hadley 622 amplifiers but no, I was aware of what account I was signed into when I wrote my posts here. I simply saw the question as a title when I signed in and thought the responses were ridiculous.

At the beginning of the pandemic, I was basically an electronic novice with a large collection of audio gear. I have dealt with many audio techs over the years and even the "good" ones have glaring shortcomings in the quality of their work I've found. Generally, I find audio techs present online to be pretty poor at articulating their value and to be frank, I know I'd never find one willing to go as far into a project as I will because it makes no economic sense for them or me. I restore gear the way I do because I enjoy the hobby, not because it makes financial sense.
 
That being said, please look at the thread I created here and then let me know if you still think I'm concerned with what I "can get away with".

Check out that thread again,
This tells me that you are one of them.
when you sign up for an account here, you have to accept, the rules of this site here and one of these rules is, no double accounts.. Something else we don't know.?
I don't care. But my trust in your words are about to be 0%.
It seems that you are defendant and lawyer and judge in one person..

Or are you just out to get recognition as you state in one of your other threads, what is wrong with being honest, for start?
A waste of time to write here any more.
 
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Hi hadley,
I'm taking you at face value, and I have commented in your other thread. You didn't provide a link so it appeared you were talking about this one. Your blind support of the OP was a real flag too. One of the other moderators found the thread you were referring to.

Your comments about other members wouldn't be one of your shining moments either. Most members are professionals at something and post honestly and deserve some level of respect. I have ignored your comments made in my direction and will assume you are young and inexperienced.

As for restoration of equipment. I have always gone the distance for my customers and I do know it is rare. Even when paid for extras, I lose time. I have redesigned equipment for improvements (measurable) and hand matched components and semiconductors to obtain the highest performance possible. I'm one of those guys you haven't run into yet, but I do know what you are talking about and agree from a purist point of view.

You have to understand that we often are not paid for extra work, and a "friend" of mine has currently decided to stick me with over $20K worth of bills for a lot of specialised work he is extremely happy with. My fault for not demanding payment, and had he not been a friend I would never have invested so much of my time doing engineering work for him. What you aren't considering is that extra technical work cannot be recovered from equipment if the owner decides to walk on the repair. So technicians are well advised to avoid becoming involved in the finer points of equipment improvements. Not to mention my well over $100K worth of bench equipment required to do this kind of work for starters.

This is too bad, because you are not trained fully in engineering which is required to understand the circuit fully in order to make improvements. In addition, you do not have the equipment required to ensure you have improved performance in every aspect. So the only folks who can do this work are the original engineers who designed these products to begin with, and a handful of technicians who invested in themselves for equipment, experience and education in order to understand what is really going on.

"Design by ear" is a fools game that never works out. Those "designers" have produced the worst equipment I have had the displeasure of working on.

So give good technicians a break. Do not expect things from them that are outside of good business practice. From now on, any engineering I do for people will be billed differently and in stages. I am forced to do this from experience with a few bad customers.

Moving forward for you. In order to get things done the way you expect, you have to be very clear about what your expectations are, then you have to listen to what your prospective tech has to say about it. This person will also need a full, complete test bench using good equipment capable of measuring to the levels of performance you expect. A sound card doesn't cut it for measuring distortion. Then you need to satisfy yourself the tech has modern parts bought through authorised channels, and has the ability and knowledge to match and measure parts for quality and value. The person is probably well over 50 years old. You will be paying for decades of solid experience and engineering knowledge.

What you want is possible with the right person. Same as when you restore a car. Their ethics will also come into play and make all the difference in the world. That is why I feel the question of morals and ethics is so darned important.

-Chris