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Old 21st April 2009, 03:49 PM   #41
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Originally posted by tigrine
Album here: http://picasaweb.google.ca/TigrineAudio
Tigrine, I'm jealous of your rectifier tubes.
One thing I may add about the oil capacitor, have you thought about putting the mounting bracket inside of chassis? It will make the cap look little shorter but cleaner from the outside. Just a thought.
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Old 21st April 2009, 07:14 PM   #42
tigrine is offline tigrine  Canada
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You're right, I thought about it. I chose the fastest option.
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Old 21st April 2009, 08:33 PM   #43
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tigrine, can I ask? What are those covers on the transformers? I'm trying to think of something to cover my OPTs. Beautiful amps you've built!
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Old 21st April 2009, 08:53 PM   #44
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The James transformers come that way...
http://tctubes.com/james-transformers.aspx
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Old 5th May 2009, 10:58 PM   #45
rknize is offline rknize  United States
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OK, well it is finally assembled. It took longer than I thought to assemble the chassis, as I made of few tweaks to the design since it was painted. This led to a few, inevitable, dings and scratches in the paint but that was inevitable.

Click the image to open in full size.

Wiring also took a while with all of the switches and so forth.

Click the image to open in full size.

One of the features I added was selectable cathode bias. I was originally going to just swap-out resistors as needed, but I decided it would be a lot more fun to be able to switch them on the fly. These resistors are connect in parallel to 680 ohm resistors. I also added some banana jacks tucked-away behind the cap to measure the cathode voltage with.

Click the image to open in full size.
Click the image to open in full size.

The recessed-and-covered tube sockets turned otu nice and clean, as I was hoping:

Click the image to open in full size.

It looks good with KT88s too:

Click the image to open in full size.
Click the image to open in full size.

More pictures and info is posted here:

http://www.knizefamily.net/russ/elec...lab-simple-se/
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Old 5th May 2009, 11:13 PM   #46
Jeb-D. is offline Jeb-D.  United States
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Looks really good
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Old 5th May 2009, 11:25 PM   #47
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Wow! Very nice build. It's getting me motivated to work on my SE and SSE...
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Old 5th May 2009, 11:54 PM   #48
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Russ. It's beautiful! When I saw the box before paint and so forth I couldn't see how great it would turn out. That selectable cathode bias. I want one. I'm going to bug you to explain it to this luddite sometime.
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Old 6th May 2009, 01:34 PM   #49
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Nice looking amp. I'm curious as to what is happening with the heatsinking on the IXCP10M45S.
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Old 6th May 2009, 05:44 PM   #50
rknize is offline rknize  United States
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Thanks all. It was time-consuming and I am a little burned-out on chassis building for now. The Tubelab SE chassis will wait I think. I did draw-up a design for it and it should be much easier to build than this thing was. It will be your typical plate-on-a-wood-box, but with a few twists....

The cathode bias select is simple. I have a spreadsheet that you can use to build a list of resistor values, if you want. The switch just selects a resistor to put in parallel with a 680 ohm that is always there. The actual values are something like: 564, 468, 434, 389, 357, and 340 ohms. Since there is always a 680 ohm resistor there, even when the switch is between contacts, I can turn the switch while the amp is on. The bypass cap slugs-out the switching enough that I don't hear any popping or anything. In fact, it takes some time for the new bias voltage to settle-in. Kinda fun to "hear" the various settings for different tubes.

As to the heatsink, I found that the little sinks ran pretty hot on the breadboard when mounted on the bottom. I think they got to 90^C after a few hours. I felt they would enjoy some additional sinking, so I tied them to the side of the chassis.

Actually, that was the cause of the only snafu I had...a burr on the plate cut through the thermal pad and shorted the CCS to ground. The CCS case is tied to pin 2, which has B+ on it. The 10k resistor didn't like that too much and I smoked it. Once that was fixed, it worked great.
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