stereo SE kt88 build ... abdellah diyaudioprojects design

[jmillerdoc]

Yea, but it is a neat looking relay. My Oddblocks use Schotty diodes so I need the relay. I probably won't use it again here unless I have too much time on my hands.
Jeff

[jmillerdoc]

Found this distributor of ASC motor run caps.....seems to have all the values of caps in one location at pretty decent prices.

Here is the page: http://www.alliedelec.com/ASC-Capacitors/

I tried to find them on eBay...not much luck with the values needed. All of them are here for around 12-18 dollars each.
Jeff

[jmillerdoc]

Can anybody tell me what the gain and output impeadence of the preamp circuit is of this amp? I am at the stage of learning to calculate these things and I was trying to figure it out myself. I am getting fumbled up on my equations. I was going to try to walk through them in reverse (sorta). Or better yet maybe someone here could walk me through the calculation.
Thanks,
Jeff

[PhilippeS]

Test of some single-ended OPT here :

http://www.sacthailand.com/Transformer_TestOutput.html

James 6123 dont seem so good.

[jmillerdoc]

Hi again,
I was wondering what anybodys thoughts might be about the added choke on the schematic at diyaudioprojects.com. I am referring to the 5H choke on the B+ to the preamp stage. I noticed there is no choke on the schematic above. I found a very economical 8H choke at www.radiodaze.com. They sell one there for 8.95. It is rated at 125mA and 150R. I was thinking of adding these to the preamp stage like the build at the above referenced site. Any thoughts or concerns?
Thanks,
Jeff

[jmillerdoc]

Originally Posted by PhilippeS

Test of some single-ended OPT here :

http://www.sacthailand.com/Transformer_TestOutput.html

James 6123 dont seem so good.

My gosh! Well I certainly won't be using the Hammond. Anybody know how to get a Silk Trafo? I have heard they are custom wound and the guy takes a while to get the job done. I don't remember where I saw the info on how to order from him, maybe somebody here knows?

[jmillerdoc]

Nevermind my request, I just erased all of the stuff at the end of the above referenced web address and went to www.sacthailand.com and answered my own question.
Jeff

[porkchop61]

Originally Posted by jmillerdoc

My gosh! Well I certainly won't be using the Hammond.

Don't forget, Hammond redesigned this output transformer to eliminate the dip in the frequency response shown in this test. I made sure and bought the revised version for my build. This was done three or four years ago, so all the transformers are now the new design. That test on that page was done on the old Hammond.
Glenn

[hoerath7]

guys keep in mind that even if that transformer test was still relevant (which it isn't) the james looks pretty good. It only looks "bad" in relation to transformers like the tango 808. For the price it is still a great performer and best buy.

[hoerath7]

I have all my parts together for this amp.. the schematic is on the first page of this thread. I have two options for layouts the first one looks like this and I know this layout will work for sure. If i have to I will build this layout.

The layout I created is this one here. I have a few questions about it and wondered if anybody here could help. Most of my concerns are related to wiring the power supply. First of all, are the transformers far enough apart and oriented in a way to avoid hum? Secondly with the rectifier in the middle of the two output transformers will I be having heat issues? When wiring the power supply for this design I am worried I will have the AC wires crossing over each other in a cobweb. Is it ok to have the AC lines cross that much?

I'm hoping for a little help here