GC passive pre-amp dissapointment

Status
Not open for further replies.
Jump to Latest
#121
Go out for a walk and come back to find so many posts to answer! 🙂

Steve Eddy I can see your picture fine. What exactly is it?

dsavitsk - I still can't see yours either 'here' or from the direct links! 🙁

Shoog - sorry to disappoint but I am running XP. :clown:

Shoog 2 - If the buffer can get away with a much simpler PSU, then that would make it a very economical version of a buffered GC. I have built a few GC's for people but they all declined the buffered option due to the extra cost! I'll experiment with a more basic PSU. Are you suggesting not using any regulation at all?

As I had such good results from using the SMPS with the GC's, I could try it with the buffer. It could be the high PSRR that is the key to success when using SMPS!

Carlos - I'm still to sort out a problem with the ouput transistors over-heating but soon I will run a three-way comparison, snubberized regulated PSU, Pedja's dicrete regulated PSU and SMPS. :hot:
 
#122
Nuuk said:
Steve Eddy I can see your picture fine. What exactly is it?
Click to expand...

It is the first of my pictures. The joke is a lot less funny at this point, I'm afraid. It is an Elvis Presley lunchbox that was bought by a friend at Graceland. I used to have a phono stage in it, but for now it is a buffer.

Nuuk said:
dsavitsk - I still can't see yours either 'here' or from the direct links! 🙁
Click to expand...

See if you can get to my site (http://ecp.cc). If not, I would guess that you either have a firewall or a DNS issue. To see which, try going to http://www.ecpsoftware.com. It uses the same DNS server and runs on the same web server. If you are able to see it, you have a firewall problem. If you are not, you probably have a DNS problem.

Nuuk said:
Shoog - sorry to disappoint but I am running XP. :clown:
Click to expand...

Linux wants to be free. Try http://www.debian.org/ or http://www.gentoo.org/

-d
 
#123
My buffer is running with just 2200uf per rail. There is a slight amount of hum, but I don't think its the buffer. The buffer was built up to replace a valve buffer and I didn't take especial care in adding it on. It on my computer amp now, which run very sensitive car drivers. Even if you had to go to 4700uf at 20V they still wouldn't be very big.
Regulation comes with some sonic costs. In the case of the Gainclone this is a plus, in most other cases I think its a minus. My gut feeling is avoid regulation unless its got proven benefits, or is absolutely neccisary. "Good" regulators can cost more than the amp to build. This is because they are effectively drain controlled amplifiers - but they have to be faster than the amp they are supplying

Shoog
 
#124
See if you can get to my site (http://ecp.cc). If not, I would guess that you either have a firewall or a DNS issue. To see which, try going to http://www.ecpsoftware.com. It uses the same DNS server and runs on the same web server. If you are able to see it, you have a firewall problem. If you are not, you probably have a DNS problem.
Click to expand...

No I can't get to any of those but this is the first time that I have had any problems. I'm using the latest version of Zone Alarm.
 
#131
dsavitsk said:


It is the first of my pictures. The joke is a lot less funny at this point, I'm afraid. It is an Elvis Presley lunchbox that was bought by a friend at Graceland. I used to have a phono stage in it, but for now it is a buffer.



See if you can get to my site (http://ecp.cc). If not, I would guess that you either have a firewall or a DNS issue. To see which, try going to http://www.ecpsoftware.com. It uses the same DNS server and runs on the same web server. If you are able to see it, you have a firewall problem. If you are not, you probably have a DNS problem.



Linux wants to be free. Try http://www.debian.org/ or http://www.gentoo.org/

-d
Click to expand...


OR: try www.ubuntu.com 😀
 
#132
Hi all,
On the subject of Linux. I know a lot of Linux wants to be free, unfortunately most of the free distros come without much software. Since i don't have broadband it no small issue to download a 10meg file. Suse Linux comes with over 1000 applications which cover just about everything. I am already running a free distro of Suse 9.2 but without the bundled software its not a lot of use.

Thanks anyway.

Shoog
 
#134
OK!
Thanks to the info kindly posted by other members regarding bias adjustment of the buffer, I am now rid of the brightness of my setup 🙂
I tried 82 ohm instead of 120 ohm, and the sound got more neutral 🙂
Also, I have found it absolutely crucial to use a 10k pot in my setup, the sound really "beefs up" when compared to a 50k pot.

I have removed the 1uf caps that I added at the +/- inputs previously, as they are not needed with the higher bias setting.

Someone asked if there was buzz in any other ppl's buffers at any volume setting, and yes, I have a buzz when my volume is at the lowest setting. I had this problem with the 50k pot too.
 
Status
Not open for further replies.
Top Bottom