Peeking inside a Carver Crimson 275 Tube Amplifier


So, I just had to pop the hood on the Carver Crimson 275 tube amplifier. I was so curious as to how this little guy weighs so little and sounds so lovely.

  • The layout is simple and clean looking. Unlike the larger monoblocks (that cost $10k), this model uses a PCB.
  • The DC restorer circuit is nicely off to one side and out of the way. It doesn’t look all that complicated but I’m no electrical engineer. Why don’t more designers use this feature? It allows the power tubes to idle around 9.75w. Amazingly efficient.
  • The amp has very good planned out ventilation and spacing. No parts are on top of each other.
  • Most of the parts quality is good. There’s a host of Dale resistors, what look like Takmans, nice RCA jacks, heavy teflon hookup wire, and so on.
  • Some of the parts quality is questionable. There’s some cheap Suntan (Hong Kong mfr.) film caps coupled to the power tubes and some no name caps linked to the gain signal tubes. I was not happy to see those, but I very much understand building stuff to a price point.
Overall, this is a very tidy build and construction by the Wyred4Sound plant in California is A grade. I’m wondering a few things.

Does the sound quality of this amp bear a relationship to the fact that there’s not too much going on in the unit? There are very few caps--from what this humble hobbyist can tell--in the signal chain. And, none of these caps are even what many would consider decent quality--i.e. they aren’t WIMA level, just generic. This amplifier beat out a PrimaLuna Dialogue HP (in my room/to my ears...much love for what PrimaLuna does). When I explored the innards of the PrimaLuna, it was cramped, busy and had so much going on--a way more complicated design.

Is it possible that Bob Carver, who many regard as a wily electronics expert, is able to truly tweak the sound by adding a resistor here or there, etc.? Surely all designers are doing this, but is he just really adroit at this? I wonder this because while some parts quality is very good to excellent, I was shocked to see the Suntan caps. They might be cheaper than some of the Dale resistors in the unit. I should note that Carver reportedly designed this amp and others similar with Tim de Paravicini--no slouch indeed!

I have described the sound of this amp as delicious. It’s that musical and good. But, as our esteemed member jjss [ @jjss ] pointed out in his review, he wondered if the sound quality could be improved further still. He detected a tiny amount of sheen here and there [I cannot recall his exact words.] even though he loved it like I do.

I may extract the two .22uF caps that look to be dealing with signal related to the 12at7 gain tubes and do a quick listening test.
Previewjbhiller
Carver was a transformer genius.


Bob carver learned how to wind output transformers from David Hafler.

<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>

Your point is? He learned and then improved as any GREAT student should. He became the "Teacher" vs student.. It happens ALL the time..

A true teachers goal, is to make those they teach BETTER because of the WAY they teach. I sure had some good teachers.. Weather they rubbed off that is a different story.. :-)

Carver made some hotrods for sure with LONG valve life.. He always had a hat on too..

Hafler was cult like, still is probably. I did some board changes for a buddy he was a BIG Hafler fan (1995 or so)
I was more of a Pass and Mac guy at the time..

Cary wasn’t even on my radar, back then. They have one I fell in love with. V12r gosh what a great amp.. 3 years now. It’s an OLDER amp design BUT a Great idea.. EASY to repair voice too.. 12 to 200 watts. Add or subtract valves and bias.. That simple.. It was made for planars.. 4 EL34s Ruby or GL KT77 or 6V6s, it don’t care..
Put 12 valves in, bias, flip to UL and look out.. 

The little Carver is no V12r but it's been voiced to please for sure, with LONG valve life.. 1/2 the weight too.

Regards
Was the Cary V12r a Dennis Had design?
I truly love my Carver M350 mono blocks!

I actually had Bob Carver at my house for a couple of days when I was demoing his speakers with the amp.

Great Guy, but getting up in the years so I don’t know what products could come next.

ozzy

Carver may have designed a pretty sweet integrated amp recently. His company put out some prototype pictures of the amp. Very cool. But it hasn’t materialized.