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#1
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FA: Ugliest homebrew linear project EVER - Ebay ad, but ya gotta see this
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=3064839871
Please - I almost never post Ebay stuff in this group, unless it very specifically relates to the homebrew crowd. I'm posting just cuz you HAVE TO SEE this piece of work. LOTS of photos - possibly the most hideous homebrew amplifier ever! If the guy didn't die testing it, I'd be surprised.... Again, sorry for the Ebay post. Don't bid - just look. It's amazing GS |
#2
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GS wrote:
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=3064839871 Please - I almost never post Ebay stuff in this group, unless it very specifically relates to the homebrew crowd. I'm posting just cuz you HAVE TO SEE this piece of work. LOTS of photos - possibly the most hideous homebrew amplifier ever! If the guy didn't die testing it, I'd be surprised.... Again, sorry for the Ebay post. Don't bid - just look. It's amazing GS Looks like this amp was designed for 3 811A's (three sockets), maybe he dropped one of the tubes? BTW I built an amp almost as ugly about 15 years ago using a pair of 4-400A's. Mine was at least safe, and it even worked on 80-20, above that the tank was not optimal and it worked poor. On 80 it tuned as broad as a barn, but I've seen SB-200's do that too. Mine was built in a pair of boxes one on top of the other that came out of a surplus computer system. The top box was the rf box (used to hold the disk drives) the bottom box was the power supply (used to hold the rest of the computer) so it looked like a sick Henry 2K. The only power transformer I could find had a 120v primary, but it was good for a real 2kw. (when ever I tuned up for more than 20 seconds I blew the 20A breaker). The plate supply was plugged into one outlet on it's own line, the relay and filament supply was plugged into a second outlet on a different line. I had a FWB rectifier using 1N4007's, each leg had 10 diodes in series with equalizing resistors and caps (WAY over built). The secondary put out almost 3kv no load, so the tubes were running a little over 4kv. The filter was 10 400uf 450v computer grade caps in series, with 20k resistors across each. A real MONSTER of a supply. There was a power resistor in series with the primary that was shorted out by a relay across a sensing resistor in series with the primary as well. This gave the HV supply a soft start so the capacitors charging wouldn't zap the diodes. Wish I kept a photo of my Frankenstein machine. |
#3
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GS wrote:
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=3064839871 Please - I almost never post Ebay stuff in this group, unless it very specifically relates to the homebrew crowd. I'm posting just cuz you HAVE TO SEE this piece of work. LOTS of photos - possibly the most hideous homebrew amplifier ever! If the guy didn't die testing it, I'd be surprised.... Again, sorry for the Ebay post. Don't bid - just look. It's amazing GS Looks like this amp was designed for 3 811A's (three sockets), maybe he dropped one of the tubes? BTW I built an amp almost as ugly about 15 years ago using a pair of 4-400A's. Mine was at least safe, and it even worked on 80-20, above that the tank was not optimal and it worked poor. On 80 it tuned as broad as a barn, but I've seen SB-200's do that too. Mine was built in a pair of boxes one on top of the other that came out of a surplus computer system. The top box was the rf box (used to hold the disk drives) the bottom box was the power supply (used to hold the rest of the computer) so it looked like a sick Henry 2K. The only power transformer I could find had a 120v primary, but it was good for a real 2kw. (when ever I tuned up for more than 20 seconds I blew the 20A breaker). The plate supply was plugged into one outlet on it's own line, the relay and filament supply was plugged into a second outlet on a different line. I had a FWB rectifier using 1N4007's, each leg had 10 diodes in series with equalizing resistors and caps (WAY over built). The secondary put out almost 3kv no load, so the tubes were running a little over 4kv. The filter was 10 400uf 450v computer grade caps in series, with 20k resistors across each. A real MONSTER of a supply. There was a power resistor in series with the primary that was shorted out by a relay across a sensing resistor in series with the primary as well. This gave the HV supply a soft start so the capacitors charging wouldn't zap the diodes. Wish I kept a photo of my Frankenstein machine. |
#4
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__________________________________________________ _______
I used to have a car I'm pretty sure was built by this guy. ROTFLMAO!!!! That is SO funny! Ya know? I think I DID TOO!!! Dave Greatsurplus |
#5
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__________________________________________________ _______
I used to have a car I'm pretty sure was built by this guy. ROTFLMAO!!!! That is SO funny! Ya know? I think I DID TOO!!! Dave Greatsurplus |
#6
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Well, at least the builder had the initiative to actually build some radio
gear, albiet a bit rough around the edges. Every edge. Bob kb8tl at arrl dot net |
#7
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Well, at least the builder had the initiative to actually build some radio
gear, albiet a bit rough around the edges. Every edge. Bob kb8tl at arrl dot net |
#8
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On Wed, 10 Dec 2003 22:22:07 GMT, "GS"
wrote: http://cgi.ebay.com/ws/eBayISAPI.dll...tem=3064839871 Please - I almost never post Ebay stuff in this group, unless it very specifically relates to the homebrew crowd. I'm posting just cuz you HAVE TO SEE this piece of work. LOTS of photos - possibly the most hideous homebrew amplifier ever! If the guy didn't die testing it, I'd be surprised.... Again, sorry for the Ebay post. Don't bid - just look. It's amazing LOL! Sure is! BTW, you'll probably find the guy who built is is just no good with his hands. He's probably a genius when it comes to the theoretical side of the hobby. Seen it before so many times it works that way. -- "I expect history will be kind to me, since I intend to write it." - Winston Churchill |
#9
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On Wed, 10 Dec 2003 22:22:07 GMT, "GS"
wrote: http://cgi.ebay.com/ws/eBayISAPI.dll...tem=3064839871 Please - I almost never post Ebay stuff in this group, unless it very specifically relates to the homebrew crowd. I'm posting just cuz you HAVE TO SEE this piece of work. LOTS of photos - possibly the most hideous homebrew amplifier ever! If the guy didn't die testing it, I'd be surprised.... Again, sorry for the Ebay post. Don't bid - just look. It's amazing LOL! Sure is! BTW, you'll probably find the guy who built is is just no good with his hands. He's probably a genius when it comes to the theoretical side of the hobby. Seen it before so many times it works that way. -- "I expect history will be kind to me, since I intend to write it." - Winston Churchill |
#10
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Bob P wrote:
Well, at least the builder had the initiative to actually build some radio gear, albiet a bit rough around the edges. Every edge. Bob kb8tl at arrl dot net If you look in some of the old QST's from the 20's you'll see most of the early transmitters were just as ugly. Old spark gap monsters! |
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