3 Band Vacuum Tube Tone Control V2

3 band tube tone control V2

     Back in 2017 I built a vacuum tube 3 band tone control based on the design of Max Robinson over at Fun With Tubes. Max has since improved the circuit using Spice. You can read about his design on his Practical Tone Controls page. As with the original circuit the improved circuit uses two 12AU7’s and one 12AX7 which is what I had used in my original tone control. This time I used one 12AU7 and two 12DW7’s. A 12DW7 contains two sections, one section is equivalent to a 12AX7 section, and the other is equivalent to a 12AU7 section.

     As always I try to use what I’ve accumulated in the parts drawer. The power supply is standard, a PC board that I had. The transformer is a 220v primary with a 200 -0- 200 secondary, and 6.3v and 8v taps. This worked nice using 120v on the primary delivering 200v across the secondary. Connecting the 8v and 6.3v taps in series provided 8v for the filament regulator when using 120v across the primary which was designed for 220v. The regulator is a bit overkill because it is designed to handle up to 10 amps output but I had the board and parts already so I used them.

  I designed the board using Express PCB Plus and had a prototype made without a silk screen. Since it worked out well and I now have the Gerber files I can have more boards made with mask and silk screen. I mounted the board where the controls are not centered vertically because I had the case which was already pre-drilled. I used the 12DW7’s because it made the PC board a little easier to layout.

Optimus Pro LX5 II speaker crossover modification and foam surround replacement

     Modification to the LX5 II speaker crossovers with the original mid woofers and replacing the foam surrounds on the them. Larry Van Wormer’s crossover modifications can be found on this web page at the Internet Archive in Microsoft Word and plain text format here. Also information for replacement of the woofers with replacements from SEAS along with crossover modification for the SEAS mid woofers.

Heathkit SG-8 RF Generator Modifications. *** SG-8 ON Steroids ***

     Yes, another Heathkit SG-8 RF generator modification video. But unlike others, this one has some existing modifications that smooth out the waveform along with a regulated B+ supply and a built-in frequency counter for accuracy! A link to the schematic and photos used in the video is here.
I wasn’t clear on where I connected the 4.7K resistor, right across the Band “A” coil. Screen shot here. I also connected the frequency counter to pin 2 of the 12AU7 through a series 560 ohm resistor and a ,47uf capacitor.

Alienware Resurrection Area 51 M7700 Vintage 2005 Laptop Restoration

     A rebuilt Alienware Area 51 M7700 vintage 2005 laptop that was trashed when I got it. After replaced some hard to find parts and a new paint job it was resurrected back to like new condition. XP Media center, Pentium 4 3.6 CPU and hardware specifications along with 3Dmark benchmark and video of one of the benchmark demos running. The reviews in 2005 praised this as the fastest laptop on the market.(Excuse me in the video for some reason I keep calling 3DMark Passmark!)

Bringing Windows 98 Into The Present, Is It Possible

     This video is about bringing Windows 98 into the present with update enhancements including running from a Compact Flash card with a compact flash to IDE adapter. Safe surfing the net and email and other Internet related things with a frugal install of Puppy Linux which installs in a Windows folder without partitioning your hard drive. Also an installed 98 system running 98 Unofficial Service Pack, 98SEME, and Revolutions Pack.

Software Links;
You will need to patch windows 98 to run with up to 4GB of ram. The extra ram makes Puppy Linux run better. Get Patchmem Here.

Get the unofficial Windows 98 service pack here
***Make sure you review the install instructions***

Get 98SE2ME service pack here.
*** For some reason my Win 10 PC flagged this as a threat but I think it was a false positive***
***Make sure you review the install instructions***

Get the Revolutions pack to change the look of 98 here.

If your Windows 98 sound hardware does not work in DOS with DOS games you need to install DOSBOX and run them from DOSBOX. To get DOSBOX to work in Windows 98 you need to put this in you Autoexec.bat file.
SET SDL_VIDEODRIVER=windib
You can install Puppy Linux by burning the ISO file to a CD. If you need to install it from a USB stick you need a program to burn it to USB such as ETCHER which you can get here.

If your PC is not able to boot from a USB stick then you can use PLOP boot manager by burning it to CD and it will enable you to boot from a USB stick. Get it here.

An inside view of a 1993 Vintage Epson Actionnote 4SLC33 Laptop Repair and the Technology Used

     A look inside of a vintage 1993 Epson Actionnote 4SLC/33 laptop which was resurrected from the dead. Specifications, prices, technology, and MSDOS 6.22, Windows 3.1 software that was used. Repair of the Dallas Real Time clock in which a instruction video can be found on YouTube.
Also a file of vintage hard drive setting from various manufactures up until the early 90’s called TheRef can be found here.

Dell Inspiron 8200

Watch as I turn an old Dell Inspiron 8200 laptop or any other into a retro gaming machine with Windows XP , Dosbox and all your old software using a fast Compact Flash card to replace a laptop’s IDE drive. Learn how with a Hitachi Microdrive driver replacement you can trick Windows XP in to seeing a Compact Flash card as a fixed disk so Windows XP can use a swap file and system restore on the Compact Flash.