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Old 22nd April 2013, 06:55 PM   #11
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If you feel a little more ambitious and want to try another slighty more complex classic tube bass preamp, I have an extra unpopulated high-quality double-sided printed circuit board for a Trace Elliot V8 preamp, which includes a switchable additional stage for overdrive, and an equisite controllable tube compressor. The extra stage and on-board compressor make it much nicer than their V-series preamp. The V8 was the company's "statement" model. British Audio Service Inc. has some of the V8 printed circuit boards for sale.
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Old 22nd April 2013, 06:57 PM   #12
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Make sure you use large high-power pots, at least comparable to what Fender or what Alembic used, if you want the same quality feel and long life.
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Old 22nd April 2013, 07:12 PM   #13
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The preamp from the V8 is 14 tube stages, so it's a lot more complicated than even the F2B with both channels. It's just that those two (F2B and V8) are my favorites, and quite possibly the two most 'classic' and desirable bass preamps. I assume you know what you wanted, I just thought I'd offer...
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Old 22nd April 2013, 08:03 PM   #14
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Yes, I'm sticking with the F2B-ish circuit for this project.

Q1 is the output buffer. Just a simple source follower.

I am just sticking with a single channel for now. With that said, this project will probably have more in common with the F1-X, but they're all based on the old Fender preamp anyway.

If I feel the need for more gain, more tone shaping, or a different sound altogether I'll adjust the design later. This could easily just be a starting point.

Also, instead of posting several one line posts just edit your original post, please.
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Old 27th April 2013, 05:16 PM   #15
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Layout finished. Haven't second checked it yet... The pdf should be 1:1; the board measures 7.25"/3.125". Plan is 1/8" Epoxy G10 material with Keystone 1540-4 turrets. Drawing shows the overall diameter of the turret base, not the hole diameter which is 0.063" for the 1540-4's.

I'm going to do a parts list later, it's all pretty standard. The power supply filter caps are Panasonic Radial 47uF/400V.
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File Type: pdf F2B Turret Layout.pdf (23.2 KB, 53 views)
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Old 27th April 2013, 07:57 PM   #16
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Looking throught the transformers at Allied.com I noticed Part # 6K27VF is a modern replacement for the Stancor PS-8415. Same secondaries, mounts the same and has similar dimensions.
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Old 27th April 2013, 08:23 PM   #17
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just watching, and saying hello cheers
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Old 1st May 2013, 06:30 PM   #18
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Got some time off, and it was a nice spring day so decided it was time to get some real work done on this project out in the garage.

This is the first turret board I've done, so I made a DIY anvil and swage as per the tubedepot plans, with one exception. I had to use a 2" bolt for the anvil as most of my turrets were placed pretty close together. Also, not that the 1540-4 turrets require a 3/32" through hole for swage fitting. Use a #43 drill bit for press fitting.

It was a lot of fun to make, and I think it turned out pretty good.
Attached Images
File Type: jpg 1.jpg (82.3 KB, 97 views)
File Type: jpg 2.jpg (71.5 KB, 97 views)
File Type: jpg 3.jpg (91.7 KB, 95 views)
File Type: jpg 4.jpg (74.4 KB, 78 views)
File Type: jpg 5.jpg (116.6 KB, 78 views)
File Type: jpg 6.jpg (89.8 KB, 14 views)
File Type: jpg 7.jpg (107.2 KB, 15 views)
File Type: jpg 8.jpg (109.6 KB, 14 views)
File Type: jpg 9.jpg (122.1 KB, 21 views)
File Type: jpg 20130501_114122.jpg (371.0 KB, 21 views)
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Last edited by Stormrider; 1st May 2013 at 06:33 PM.
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Old 1st May 2013, 06:35 PM   #19
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Old 1st May 2013, 09:27 PM   #20
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Why did you decide to make them so close and package tight? Nice work! I just prefer extra space.
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