DCAudioDIY.com

DC Area Audio DIYer's Community
It is currently March 28th, 2024, 6:30 am

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 24 posts ]  Go to page Previous  1, 2, 3  Next
Author Message
PostPosted: December 30th, 2021, 12:49 pm 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1701
Location: Parkville, Maryland
I kind of didn't pay this thread much mind until I got curious and looked at the schematic. YIKES!

Bob is calling for a stasis bias of 25-ma. My experience has been that biasing KT-88s below 36-ma results in a hard-edgy sound and biasing above results in a "dark" smothered sound. So I would guess that to meet his warranty expectations he "low balls" the bias to make the tubes last longer then "band-aids" the crap out of his design in an attempt to get rid of the nasties created by the low bias. Zobel networks -- complicated heavy feedback -- and filter networks between stages and the cathode of the first stage. This was a disappointing experience -- I would have thought Bob Carver knew better. :o

I have yet to see any DIY'er on this blog make bone-head decisions like that. WOW!! Buyers Beware!

_________________
Walt


Top
 Profile  
 
PostPosted: December 30th, 2021, 1:03 pm 
Offline
User avatar

Joined: February 28th, 2013, 3:31 pm
Posts: 1780
A couple of years back, there was a DC HiFi group meeting at Greg Viggiano's place and they had a Carver tube amp there which if my memory serves me was the 275. I also brought the Cherry Bomb which is 15 watts at 8 ohms. When we replaced the Carver with the Cherry Bomb, everyone was amazed at the better quality sound from the Cherry Bomb. They also thought the Cherry Bomb was more dynamic which surprised me. Now I know why.

Tom


Top
 Profile  
 
PostPosted: December 30th, 2021, 1:25 pm 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1701
Location: Parkville, Maryland
tomp wrote:
A couple of years back, there was a DC HiFi group meeting at Greg Viggiano's place and they had a Carver tube amp there which if my memory serves me was the 275. I also brought the Cherry Bomb which is 15 watts at 8 ohms. When we replaced the Carver with the Cherry Bomb, everyone was amazed at the better quality sound from the Cherry Bomb. They also thought the Cherry Bomb was more dynamic which surprised me. Now I know why.

Tom

Having first-hand experience with Tom's Cherry Bomb in my system -- Tom's shoot-out description is no idle bragging. The Cherry Bomb is one of a kind. :thumbup:

_________________
Walt


Top
 Profile  
 
PostPosted: January 17th, 2022, 10:47 am 
Offline

Joined: February 28th, 2013, 3:31 pm
Posts: 363
Looks like Amir got his basement cleaned up after the flooding and finally measured the amplifier.

https://www.audiosciencereview.com/foru ... amp.29971/


Top
 Profile  
 
PostPosted: January 17th, 2022, 11:43 am 
Offline

Joined: March 12th, 2013, 11:12 am
Posts: 738
This will give fodder for the next two decades to every measurement happy "Objectivist" audiophile to claim that tube amps suck, measure poorly and are a rip-off. :clap:


Hopefully that will reduce demand and lower costs. I am sick of spending $60 for a 6SN7.


Top
 Profile  
 
PostPosted: January 17th, 2022, 2:08 pm 
Offline
User avatar

Joined: February 28th, 2013, 3:31 pm
Posts: 1780
Not quite true. The take away from this should be that all poorly designed or cpnstructed amps whether tube or solid state suck. Want to measure and hear an exemplary tube amp? Audition one of David Berning's.


Top
 Profile  
 
PostPosted: January 22nd, 2022, 11:40 am 
Offline

Joined: July 17th, 2016, 6:24 am
Posts: 1099
This is the screen cap of ASR Carver Crimson review. What are the Cap and resistor across the speaker terminal for?

Attachment:
delme1.jpg
delme1.jpg [ 55.93 KiB | Viewed 3709 times ]


Top
 Profile  
 
PostPosted: January 22nd, 2022, 11:48 am 
Offline
User avatar

Joined: January 15th, 2015, 7:19 am
Posts: 1697
Location: Baltimore MD
is it not what they call a zobal .


Top
 Profile  
 
PostPosted: January 22nd, 2022, 11:53 am 
Offline
Site Admin
User avatar

Joined: February 28th, 2013, 10:38 am
Posts: 1682
Pelliott321 wrote:
is it not what they call a zobal .

:clap:

_________________
I can explain it to you, but I can’t understand it for you.


Top
 Profile  
 
PostPosted: January 22nd, 2022, 11:56 am 
Offline
User avatar

Joined: January 15th, 2015, 7:19 am
Posts: 1697
Location: Baltimore MD
Its just a filter. Some speaker manufacturers claim big black magic here.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 24 posts ]  Go to page Previous  1, 2, 3  Next

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 34 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group