Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old December 10th 03, 10:22 PM
GS
 
Posts: n/a
Default 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   Report Post  
Old December 11th 03, 02:23 AM
kenneth scharf
 
Posts: n/a
Default

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   Report Post  
Old December 11th 03, 02:23 AM
kenneth scharf
 
Posts: n/a
Default

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   Report Post  
Old December 11th 03, 05:12 AM
GS
 
Posts: n/a
Default

__________________________________________________ _______

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   Report Post  
Old December 11th 03, 05:12 AM
GS
 
Posts: n/a
Default

__________________________________________________ _______

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   Report Post  
Old December 11th 03, 11:43 AM
Bob P
 
Posts: n/a
Default

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   Report Post  
Old December 11th 03, 11:43 AM
Bob P
 
Posts: n/a
Default

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   Report Post  
Old December 11th 03, 05:31 PM
Paul Burridge
 
Posts: n/a
Default

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   Report Post  
Old December 11th 03, 05:31 PM
Paul Burridge
 
Posts: n/a
Default

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   Report Post  
Old December 12th 03, 01:41 AM
kenneth scharf
 
Posts: n/a
Default

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!



Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
FA: Heathkit SB200 Linear Amplifier, Works Great, NR: EBay Mark Petereit Equipment 0 March 8th 04 12:12 AM
FA: The most HIDEOUS homebrew linear I have ever seen! Fun to see GS Boatanchors 18 December 18th 03 05:45 PM
FA: Homebrew linear amplifier power supply on Ebay GS Boatanchors 0 November 27th 03 09:03 PM
RF amps: tuned load in Class A? Don Pearce Homebrew 141 September 15th 03 05:02 AM


All times are GMT +1. The time now is 10:13 AM.

Powered by vBulletin® Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright 2004-2019 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017