Universal stereo amplifier for long-term ownership.

[Roland68]

LMAO this reads like some Class A/ AB amplifier lover propaganda.

If you ignore the original question and completely take my post out of context, then yes.
Otherwise, you've just given a hasty answer without reading and understanding what the question is about.

The question specifically asked about very durable amplifiers with good repair options.
I have this experience with several large NAD and Yamaha amplifiers and power amplifiers from the last 40 years.
In addition, I have experience with various Class D amplifiers of different technologies and with a large number of switching power supplies from industrial and IT applications from the same period.

Over the last 30 years, I've seen a significant number of defective/failed B&O/IcePower amplifier modules that couldn't be repaired. The failure often occurred within the first 2-5 years.
Furthermore, there are the various failures of the inexpensive (outdated) Hypex and sometimes Purifi modules, where the lack of repairability after the warranty period bothers me the most.
In addition, there are the various failures of the inexpensive (outdated) Hypex and sometimes Purifi modules, where the lack of repairability after the warranty period bothers me the most.

``` If you had actually read the thread before replying, you would have noticed that I also recommended Class D amplifiers, specifically those based on the TPA3255, as well as the Axign-based models from SMSL/Sabaj, where failures in most cases probably only involve the capacitors, which cost a few euros. But even that wasn't what the original poster was looking for.

By the way, I usually recommend Class D amplifiers out of conviction, as I use them myself. Only for high-power applications do I still use my over 30-year-old NAD amplifiers, due to their robustness, price, and repairability/replaceability.

Perhaps in the future you should do some research and read before giving out "propaganda" answers.
Feedback geben

 

[monsterlag]

If you ignore the original question and completely take my post out of context, then yes.
Otherwise, you've just given a hasty answer without reading and understanding what the question is about.

The question specifically asked about very durable amplifiers with good repair options.
I have this experience with several large NAD and Yamaha amplifiers and power amplifiers from the last 40 years.
In addition, I have experience with various Class D amplifiers of different technologies and with a large number of switching power supplies from industrial and IT applications from the same period.

Over the last 30 years, I've seen a significant number of defective/failed B&O/IcePower amplifier modules that couldn't be repaired. The failure often occurred within the first 2-5 years.
Furthermore, there are the various failures of the inexpensive (outdated) Hypex and sometimes Purifi modules, where the lack of repairability after the warranty period bothers me the most.
In addition, there are the various failures of the inexpensive (outdated) Hypex and sometimes Purifi modules, where the lack of repairability after the warranty period bothers me the most.

``` If you had actually read the thread before replying, you would have noticed that I also recommended Class D amplifiers, specifically those based on the TPA3255, as well as the Axign-based models from SMSL/Sabaj, where failures in most cases probably only involve the capacitors, which cost a few euros. But even that wasn't what the original poster was looking for.

By the way, I usually recommend Class D amplifiers out of conviction, as I use them myself. Only for high-power applications do I still use my over 30-year-old NAD amplifiers, due to their robustness, price, and repairability/replaceability.

Perhaps in the future you should do some research and read before giving out "propaganda" answers.
Feedback geben

Maybe it’s because of the “40 years”. Class D used to be absolutely terrible but it has come a long way. I understand that goes counter to decades of your experience and is hard to accept but you are just reinforcing cliches without actual data.

Feel free to use your 30 year old amp because you feel comfortable but your anecdotal experience doesn’t trump actual data. There are so many reviews on here for Class D amps from Amir and others.

 

[john61ct]

The issue discussed here is not perfornance quality but longevity and easier repairability, where usage over many decades is desired

 

[monsterlag]

The issue discussed here is not perfornance quality but longevity and easier repairability, where usage over many decades is desired

Newer Class D amps haven’t been around for 30-40 years… to definitively say that they won’t last is completely off base. How is this difficult to comprehend? There is nothing about current crop of good Class D amplifiers (HypeX/Purifi etc) that indicates they can’t last 30-40 years or whatever arbitrary timeline you decide that determines longevity.

 

[l_lama]

I learned that the Rotel RB-1552 and RB-1582 mk2 both have the same gain on XLR inputs, but different input voltage sensitivity (2.5V vs 3V).

Given the same gain (voltage multiplier) of 22.5 dB on their inputs, I think that the loudness of both units driving the same speakers will increase in absolutely the same way - proportionally to the input voltage multiplied by the gain, until the input voltage reaches 2.5V. At that point, the smaller unit will clip, while the larger unit will continue pushing loudness further.

So even if I downsize, I will still be listening at the same 8.5% to 13% of the pre-amplifier's volume. Is that correct?

 

[john61ct]

I made no such assertion and in fact care not a whit about any debate based on "Class D" vs other types.

Fact is, everything fails, the main issue is repairability, and my example (GFA-555) continues to exhibit that trait.

It is "extraordinary claims" that require extraordinary evidence - someone asserting that Class D as a group WILL do the same must back that up with evidence.

The opposite is the self-evident default while such evidence is lacking, but

that is not to say that specific examples may well become the exception that proves the rule.

Newer Class D amps haven’t been around for 30-40 years… to definitively say that they won’t last is completely off base. How is this difficult to comprehend? There is nothing about current crop of good Class D amplifiers (HypeX/Purifi etc) that indicates they can’t last 30-40 years or whatever arbitrary timeline you decide that determines longevity.

 

[Avp1]

For long term ownership look at Bryston. 20 years long manufacturing warranty on pre- and power amplifiers. No one comes even close!

 

[Mnyb]

I learned that the Rotel RB-1552 and RB-1582 mk2 both have the same gain on XLR inputs, but different input voltage sensitivity (2.5V vs 3V).

Given the same gain (voltage multiplier) of 22.5 dB on their inputs, I think that the loudness of both units driving the same speakers will increase in absolutely the same way - proportionally to the input voltage multiplied by the gain, until the input voltage reaches 2.5V. At that point, the smaller unit will clip, while the larger unit will continue pushing loudness further.

So even if I downsize, I will still be listening at the same 8.5% to 13% of the pre-amplifier's volume. Is that correct?

You seems to have a gain stagin issue , it’s possible thet pre has to much gain ? Sensitivity about 2,5 v is not bad older amps could have 0,6 v for full power ? Some classic stuff equipment do have to much gain a layover from the past with older analog sources that did not put out 2v unbalanced that most cd players tend to . Think for example an old tuner and then reception is not that strong or an old cassette or vhs then you needed to able to crank it up .

Results, to much gain just to accommodate every conceivable use case .

 

[l_lama]

You seems to have a gain stagin issue , it’s possible thet pre has to much gain ?

It is Onkyo P-80 with:

Rated XLR Output Level and Impedance

・2 V/220 Ω (L/R PRE OUT)

Having for Rotel:

Input Sensitivity

Line Level Inputs (XLR): 3.0 V

I assume the pre-amp can't do more than 2/3 of power amp-power, though it is still too loud, probably due to listening distance and speaker's sensitivity of 89dB

 

[Whiskey the Cat]

For long term ownership look at Bryston. 20 years long manufacturing warranty on pre- and power amplifiers. No one comes even close!

Unfortunately, this appears to be no longer true. The information on the Bryston website is conflicting and out of date. (Still has their old address for one example.) My dealer is at some pains to say that the Bryston warranty is 10 years only, and you MUST be able to produce the sales receipt. The warranty is not transferable should the unit be sold. That is only for analog electronics: For digital it is only 5 years, excluding the drive in CD players for which the warranty is 2 years. I got the impression that my dealer tries to steer people away from Bryston saying that getting product out of the factory is very time consuming and difficult.

The product range on offer also seems to have shrunk considerably in recent years. Overall the company looks under resourced and struggling a bit. Looks like a beancounter or two is making some decisions. All of which is a bit disappointing.