Carver 275

TubeHiFiNut

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Thank you for posting your findings, Paul.

As long as an amplifier is designed to operate safely, Observation (listening) is the test I use to determine how much I like a component.

I have not heard the Crimsom 275 and will, therefore, not comment further.
 

John Frum

Secret Society Member
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Thank you for posting your findings, Paul.

As long as an amplifier is designed to operate safely, Observation (listening) is the test I use to determine how much I like a component.

I have not heard the Crimsom 275 and will, therefore, not comment further.

I’m glad that HFH isn’t ASR, because, like you, I don’t think there’s any possible set of measurements that will tell me how much I will or won’t like a particular piece of audio equipment.

Honest data isn’t a bad place to start, though.

Knowing what you now know about the Crimson 275, would YOU consider auditioning it? Would your knowledge of the falsehoods (I’ll stop shy of words that ascribe intent) in the published specs steer you away from other products from the same manufacturer?

I can only speak for myself.

I’m extremely grateful to Paul for purchasing and sharing his analysis of the JBH tube amplifier, in which he exposed design flaws that seriously compromise the performance of the amp. I’d have otherwise spent $270 on it, and feel like I dodged a major bullet. If I had been considering the Crimson 275 before, I’d be over ten times as grateful to him now.
 

TubeHiFiNut

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I’m glad that HFH isn’t ASR, because, like you, I don’t think there’s any possible set of measurements that will tell me how much I will or won’t like a particular piece of audio equipment.

Honest data isn’t a bad place to start, though.

Knowing what you now know about the Crimson 275, would YOU consider auditioning it? Would your knowledge of the falsehoods (I’ll stop shy of words that ascribe intent) in the published specs steer you away from other products from the same manufacturer?

I can only speak for myself.

I’m extremely grateful to Paul for purchasing and sharing his analysis of the JBH tube amplifier, in which he exposed design flaws that seriously compromise the performance of the amp. I’d have otherwise spent $270 on it, and feel like I dodged a major bullet. If I had been considering the Crimson 275 before, I’d be over ten times as grateful to him now.
I appreciate the opportunity to read and consider Paul's findings - and I find them very interesting.

Just stating that my personal evaluation method for an amp that I am considering is to listen and observe over time.

The Crimsom 275 does not fit any current amplifier niche in my system that needs to be filled.

I hope that Paul, and other Havenites, post lots additional comments and reviews (both Observation and Measurements based) for a wide variety of audio components and accessories. :)
 

240sx4u

Technically It's LexusGuy
The power output numbers it's rated at seems outright deceptive. Unfortunate as I am almost always a Bob Carver fanboy.
 

TubeHiFiNut

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Wonder what this amp sounds like? Has anyone done extended listening observations of the Crimson 275 using compatible speakers?
 

JohnVF

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using compatible speakers?
That's the part about this whole thing that gets me. I already have an amazing 15wpc tube amplifier. I rarely use it because my speakers need more power. I, in theory, could have been persuaded to buy this amp thinking it was 75wpc, which is in the ballpark of what my speakers need to wake up. Had I done so, its looking like I would be right back where I started (with an amp that probably sounds worse than the 15wpc Leben it was to replace, just looking at parts quality). So I, as the end user, get screwed out of $2500 or whatever it is, for no gain.
 

Thermionics

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That's the part about this whole thing that gets me. I already have an amazing 15wpc tube amplifier. I rarely use it because my speakers need more power. I, in theory, could have been persuaded to buy this amp thinking it was 75wpc, which is in the ballpark of what my speakers need to wake up. Had I done so, its looking like I would be right back where I started (with an amp that probably sounds worse than the 15wpc Leben it was to replace, just looking at parts quality). So I, as the end user, get screwed out of $2500 or whatever it is, for no gain.
Well, 15 watts of gain. ;)
 

paulbottlehead

Active Member
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Here are some excerpts from the ASR review of a sealed unit I bought and dropped off for Amir to check out:
1642275919126.png
1% THD is -40dB below the fundamental, so with a 4 ohm load this amp makes less than 2W at 1% THD above 5kHz. If we are using 4 ohm loading and 1% THD from 20Hz-20kHz to rate this amplifier (as Carver does), this is a 0.5W RMS amp.

1642276008939.png
Doing a burst tone, Amir was able to just eek out 75W, but again this is at 1kHz and trying to do this at 20Hz blows fuses at 14W.

At the end of the day, this amp measures a bit differently than my samples. While I wasn't able to resolve any output below 1% THD at 20Hz, the factory sample managed 5W and seems to do a bit better overall, but still is well off of the manufacturer's specifications. On the flipside, the Carverfest samples seem to do a bit better up top, but my FFT is a bit more forgiving since it doesn't capture as many of the ultrasonic harmonics as Amir's gear does.

ASR Independent Test
 
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It's good to see confirmation.
Looking at the schematic, it is designed as an amp that could deliver 75 watts. But it is definitely a victim of the parts used, the build quality, and a few fundamental errors.
So lets take one of them, re-build and properly earth the power supply, replace the output transformers, replace the wing with something more suitable, and correct any other errors and you'd have a decent amp (for another $1000.00)
 
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