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Old 20th August 2011, 03:15 AM   #1
tinitus is offline tinitus  Europe
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Default BOX in the making

Hi,
though I'm building this box for a Pass B1 pre, it is very tempting to use it for small TUBE amp instead

if anyone else are interesting in showing their box stuff her, please do
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File Type: jpg IMG_5041 (Large).JPG (86.4 KB, 532 views)
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Old 20th August 2011, 10:56 PM   #2
roline is offline roline  United States
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Default Wood Chassis, Some assembly required

Some assembly required; take part A,(wrong size), insert in part B,(not included), use instructions (in Latin) if all else fails. Help line is "Dial a Prayer"...
I do a 3 sided box with removable back. All sides slotted for the top plate to slide into place. Also bottom plate can slide into place. No screws from top or sides. Corners are 45 deg, back held in place 2 screws on each side.
I use a forsener bit to drill the recesses in the front or through hole for the amp gage and nixie tube. Also use it to recess the back side to get the front to the correct thickness for the power switch, volume pot, phonojack input for MP3 and bias switch.
The aluminum top plate is more of a challenge to slot the vent holes on a mill with centering jig at the tube centers.
Lots of sanding , a little stain and 7 coats of tung oil....
The top plate is assembled as far as possible and then slid into place for the final wiring to the front and back. Add tubes, fuse, power, input, speakers and cold beer, power up and adjust bias, crank it up...... AHhhhhhhh
Attached Images
File Type: jpg compactron side view2.jpg (153.0 KB, 462 views)
File Type: jpg P2090407.jpg (358.9 KB, 446 views)
File Type: jpg P2090409.jpg (378.3 KB, 416 views)
File Type: jpg P2090405.jpg (550.9 KB, 132 views)
File Type: jpg P3270500_a.jpg (838.1 KB, 172 views)
File Type: jpg comp2-f2.jpg (361.5 KB, 210 views)
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Old 21st August 2011, 03:43 AM   #3
TheGimp is offline TheGimp  United States
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I like the copper.
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Old 21st August 2011, 06:57 AM   #4
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Quote:
Originally Posted by roline View Post
and nixie tube.
Nice work.
What's the nixie for?
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Old 21st August 2011, 03:39 PM   #5
TheGimp is offline TheGimp  United States
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Probably to indicate which tube is showing bias current on the meter.
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Old 22nd August 2011, 01:28 AM   #6
roline is offline roline  United States
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The nixie just shows what tube is displayed on the amp meter.
6 position dual pole; to the nixie nc, 0,1,2,3,4 and to the meter nc, nc, 1,2,3,4

I bought a dozen nixies because they are cool, had to find something to use them for.
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Old 22nd September 2011, 01:20 AM   #7
roline is offline roline  United States
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Default Compactron amps

The first 2 in the series, 1 more on the way...
First was 6JN6 based, 2-25watt
2nd was 6GV5 based, 2-40watt
The next is 6LB6 based.. 2-60watt currently doing the sheet metal and wood work.
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Old 22nd September 2011, 11:53 AM   #8
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Nothin' like Nixies here just some Padauk and shellac for the finished amp; the unfinished pre-amp chassis' native walnut will get Natural Watco, then shellac. The amps top plate is powder coated 1/8" aluminum, the pre-amp and all subsequent plates will get anodized. Powder coat smudges and marks just from dusting. Who knew?
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File Type: jpg 45 Amp1.jpg (238.3 KB, 100 views)
File Type: jpg IMG_1384_1.JPG (314.7 KB, 119 views)
File Type: jpg IMG_0778_1.JPG (322.2 KB, 128 views)
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Old 16th October 2011, 03:27 AM   #9
roline is offline roline  United States
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Default Compactron Hybrid Headphone Amp.

A dedicated headphone amp, Hybrid circuit tube 1st and 2nd stage with a Mosfet class A follower for low impedance drive capability. Just got the box glued up, prior to the sanding marathon, staining and 8 coats of tung oil. This Amp is designed to be the base unit under either of the power amps above, same foot print. It uses the same compactron triple triode as the first and second stage in the power amp. There are more than 5 compactrons that can be swapped out, Ive tried the 6u10, 6ac10, 6ak10, 6av11 and 6d10.
After I through an extra winding on the toroid that I had, I found an Antek that was a direct drop in. just slightly larger in size
I tried to cut a piece of glass for the window, with little success. Decided to use a piece of lexan instead.
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File Type: jpg ha-back1.jpg (382.2 KB, 61 views)
File Type: jpg ha-6.jpg (295.6 KB, 61 views)
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Old 21st October 2012, 02:15 PM   #10
roline is offline roline  United States
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Default Chassis construction KEG-EAR Amp

A 6L6-KT88 based amp with the same basic box design. This one has LED bias monitor instead of a nixie-amp meter combo.
The top plate is machined by a combination of drill bits, stepped drill bits for the transformer wire pass holes, Greenlee punch for the tube holes, and a milling machine for the slotted tube holes. I spend a couple hrs polishing the top plate after deburring and sanding the tube holes.
The front and back are machined with forstner bits and a dremmel tool with a router bit. The components are verified for fit and then the sanding marathon and assembly start. The front and sides are joined and the top and bottom plates just slide in the saw kerfs. The back secures the assembly.
I pre-wire the top plate assembly and also pre-wire the wood chassis. Slide the top plane in and complete the wiring. After initial fire-up, bias voltage confirmation, slide the bottom plate in place to finish the Amp.
The bias monitor is switched, you can watch the tubes bias up and twinkle to the music, or just turn them off...
Attached Images
File Type: jpg 4.1 chassis.jpg (737.3 KB, 39 views)
File Type: jpg 6.1 chassis front.jpg (118.7 KB, 24 views)
File Type: jpg 6.2 chassis back.jpg (761.5 KB, 20 views)
File Type: jpg 6.3 chassis side_c.jpg (111.2 KB, 34 views)
File Type: jpg 7.0 chassis front.jpg (73.1 KB, 31 views)
File Type: jpg 7.1 chassis back.jpg (92.6 KB, 21 views)
File Type: jpg 7.15 bias monitor.jpg (110.3 KB, 28 views)
File Type: jpg 8.0 Assembled_b.jpg (156.1 KB, 34 views)
File Type: jpg 9.1 fired_up1c.jpg (67.6 KB, 29 views)
File Type: jpg 9.2 fired_up7.jpg (377.5 KB, 29 views)
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Last edited by roline; 21st October 2012 at 02:23 PM.
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