6CU6 Sweep Tube Monoblock Power Amp Build Log - diyAudio
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Old 7th November 2013, 02:12 AM   #1
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Default 6CU6 Sweep Tube Monoblock Power Amp Build Log

Hello everyone!

I am pleased to announce I have started my second (from scratch) tube project!

I have previously made a low voltage line level tube preamp (I"ll insert a link to the thread I'll make here, but you can see a picture of it in my user picture) which I designed and built myself (including the chassis), but now I've decided I'd like to try a tube power amp.

I had purchased two 6CU6's after playing around with a 6CD6 sweep tube on 30V on my bench and I intended to use both 6CU6's to make a big stereo tube amp, with all new components.

Due to budget constraints, I'll be starting a bit smaller, with a single monoblock, which I will design and build myself (including the chassis).

I invite everyone to leave any comments or suggestions about this project right here in this build log, which I will be updating regularly (with pictures )!!!
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Last edited by TheTubeAmper; 7th November 2013 at 02:20 AM.
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Old 7th November 2013, 02:17 AM   #2
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I've already ordered almost all of the parts I'll need but I won't spoil the surprises until they arrive.

Firstly I'll start out with what I did today, which is starting to build the chassis. I plan to have a single piece of metal that will be the middle of the tube chassis, from the back to the middle to the front, and good looking wood on the sides.

I started with a piece of metal from a scrap computer case and began drawing up my plans:

Click the image to open in full size.

I then did most of the cutting and bending, so now the metal part of the chassis is mostly done! Also note I'll be adding a metal mesh cage to go over the top of the tube amp and cover everything.

Click the image to open in full size.

Click the image to open in full size.

Thank you for looking!
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Read and Follow my posTs at your own discretion, and risk. I'm an Electronics and Audio Hobbyist who likes tube amps too! Please check out my projects at http://thetubeamper.com/

Last edited by TheTubeAmper; 7th November 2013 at 02:44 AM.
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Old 7th November 2013, 02:45 AM   #3
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I will be following along. I have quite a few of the 12v variants of that tube in my stash. Good luck!
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Old 7th November 2013, 06:55 AM   #4
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Quote:
Originally Posted by TheTubeAmper View Post

Due to budget constraints, I'll be starting a bit smaller, with a single monoblock, which I will design and build myself (including the chassis).

I invite everyone to leave any comments or suggestions about this project right here in this build log, which I will be updating regularly (with pictures )!!!
As soon as you show the schematic, it would be possible to give comments.
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Old 7th November 2013, 06:41 PM   #5
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Quote:
Originally Posted by artosalo View Post
As soon as you show the schematic, it would be possible to give comments.

Well that may be a while because I'm making this up as I go, using what I have and what I've bought.

I do know however, that I'll be using a single 12au7a to drive a single 6CU6 at about 180VDC.
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Old 8th November 2013, 02:42 AM   #6
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Today I got a bit more work done on the chassis. Its pretty much done, all I need is wood on the sides now.

Hopefully you can see that the back is at a 90 degree angle while the front is more shallow.


Click the image to open in full size.

Click the image to open in full size.


I think for now I'll use some scrap wood and then later on I'll buy some good plywood for the sides. Other than that all I'll have to do is drill out the holes for everything and then paint it and assemble it!

Thanks for looking!
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Old 9th November 2013, 03:37 AM   #7
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Today I did a lot of work on this project. I did more work on the chassis, including paint, and I even got started on the wiring!

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

Hopefully tomorrow I'll get the output transformer and get more work done on the wiring, then maybe I can have an initial power up tomorrow!
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Old 11th November 2013, 03:03 AM   #8
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It lives!

Although its not completely finished, and it still has some kinks to be worked out, this amp is working!

Considering I didn't base this amp off of any schematics, I'm very excited that my knowledge coupled with trial and error was enough to get this amp working, and quite well I must say.

Now this is the first tube amp I've heard in person so take this very lightly, but I think this sounds amazing. Due to the small OT there is absolutely no lows, but the mids and highs sound so clear and vibrant!

I'll get some pictures soon!
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Old 12th November 2013, 01:10 AM   #9
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I've run the amp for three hours today and it seems to be working fine! I have yet to add the other side of the 12au7a to the gain stage as well as work out a few other bugs but this amp is working!

Here is some pictures of it. Please note I will make some wooden pieces for the sides as well as a metal mesh cage that is removable to go over the top to protect people from heat and electricity. The front power switch and volume knob are also not currently implemented.

Click the image to open in full size.

Click the image to open in full size.

I'll continue to keep updating this log as well as post a schematic at some point after this is completely finished.

Don't hesitate to post any comments or suggestions!
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Old 13th November 2013, 04:30 AM   #10
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Wheres everybody at?

No love for my amp?
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