Heathkit SB-220/1 Super Large Capacitor Bank + HV diode board. Kits with parts
If you are rebuilding a Heathkit amplifier and the filter capacitors are looking a little shabby this is for you. I finally made a PC board for the larger Capacitor bank that I have been putting into SB-220s. This kit has over double the original capacity of the original bank to give the old girl a bit more pep. It has to go in sideways compared to the original capacitors but because the caps are smaller, there is actually more room for ventilation. It did require a new sheet metal housing, that is also included (professionally made, not by me). This more than doubles the original capacity of the filter bank and makes for a very clean install. The more robust power supply will probably not make much difference on CW but it can be significant on SSB where peak demand is more critical than average power. It includes the capacitors and the needed hardware for installation.
You will need to drill just one hole in the chassis depending on the age of your SB-220/1 but it is not a difficult install (A dozen screws and 3 wires). The transformers do not need to be removed. The board layout will also accommodate other size electrolytic capacitors should you (or some future owner) ever decide to replace them. The bracket provides the holes for mounting the new HV-diode board on the front, in the same general location as the original.The HV -diode board is also included and is intended to be a replacement for the original board that came with the SB-220 and SB-221. IT IS A KIT , with all of the needed parts to populate the board included. This board includes a number of improvements over the original. It has connectors to allow the front panel to be removed or extended during service. The original pads are still present and can be used if connectors to the front panel are not desired. >A string of 1N5408 diodes for the voltage doubler (larger than the originals). >A filter cap across the high voltage output. >Diode protection for the plate meter. >A string of 1N4007 or larger diodes to replace the original Zener, including capacitors to filter the voltage. >A string of 2meg 1% resistors to divide the high voltage for the voltmeter. >A limiting resistor to provide the current for LEDs on the panel meters if you decide to do that. How this happened: The combination of being retired and being a ham leads to a lot of tinkering. The internet is full of advice, some good, some bad, and some absurd, so I selected a reasonable subset of information and did a respectable job of rebuilding a couple of amplifiers. But along the way the tinkering spirit led me to lay out a couple of PCBs to clean up some of my work. So when the boards eventually came in, the chassis went back on the bench and went through another revision. And like so often happens, I realized that the boards could be a little better and set out to design another set. Well, when you order printed circuit boards, you dont get just one. There is no intent here to compete with the other boards (W7RY and others), they do a good job and provide a reliable source for much needed replacement parts. If you need this I assume that you are qualified to work on high voltage circuits and will take all safety precautions. I made every effort to do a good layout and provide quality parts, however, I can take no responsibility for your work or any damage to your equipment. If you are not familiar with electronics and especially working around high voltage, this may not be for you. The pictures are for information, you do not get a SB-220 or assembled boards. You will get just the boards, the parts needed to populate them, some basic instructions and a copy of the schematic. The pictures are examples and are from several different amplifiers.
The components you receive may be a different style but the values will be correct. Assembly should be obvious, but I provide some basic instructions. I also have a Control board with some useful features for the SB-220. You might look into installing that while you are doing the upgrade to your amp. Sorry about the price, I wish it could be less but the bits and pieces just add up.I will do my best to get everything in the box, but if I forget or you break a part, you are on your own for replacements. The item "Heathkit SB-220/1 Super Large Capacitor Bank + HV diode board. Kits with parts" is in sale since Saturday, December 28, 2019. This item is in the category "Consumer Electronics\Radio Communication\Ham, Amateur Radio\Ham Radio Amplifiers". The seller is "iroriqm" and is located in Ramona, California. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Bermuda, Ecuador, Luxembourg, Paraguay, Reunion, Viet nam, Uruguay, Russian federation.
- Brand: AG6YJ
- MPN: Does Not Apply