Home |
Search |
Today's Posts |
#31
|
|||
|
|||
W7TI wrote:
If you're using octal type tubes, there are sockets made for industrial relays which fit the tubes perfectly. They are as you describe; surface mount with side terminals. They no doubt add a small amount of inductance and capacitance which could affect VHF operation, something to keep in mind. McMaster-Carr has them on page 819 of their online catalog: http://www.mcmaster.com/ Very nicely done!!! Thank you. These are the ideal thing for an experimenter. -- regards from :: John Bartley 43 Norway Spruce Street Stittsville, Ontario Canada, K2S1P5 ( If you slow down it takes longer - does that apply to life also?) -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#32
|
|||
|
|||
Michael Black wrote:
"Ralph Mowery" ) writes: Aluminum is usually easier for most to work with with simple hand tools. Steel is fine but it might rust and look bad after a while. Make the chassie out of whatever kind of metel that you think is the best for you to work with . Electrically there will be little if any differance. And of course, everyone did use steel (once things progressed beyond wood and bakelite chassis) right up until aluminum because readily available and/or cheap enough, at which point I doubt anyone used steel except if what they were building was really really heavy, ie a kilowatt modulator or final. Michael VE2BVW I have seen a few nice layouts on Brass chassis, as well. Easier to work than steel, and you can still solder to it. I built some tube RF decks on 1/16" brass sheet stock, and mounted them into a steel cabinet years ago. -- Michael A. Terrell Central Florida |
#33
|
|||
|
|||
Michael Black wrote:
"Ralph Mowery" ) writes: Aluminum is usually easier for most to work with with simple hand tools. Steel is fine but it might rust and look bad after a while. Make the chassie out of whatever kind of metel that you think is the best for you to work with . Electrically there will be little if any differance. And of course, everyone did use steel (once things progressed beyond wood and bakelite chassis) right up until aluminum because readily available and/or cheap enough, at which point I doubt anyone used steel except if what they were building was really really heavy, ie a kilowatt modulator or final. Michael VE2BVW I have seen a few nice layouts on Brass chassis, as well. Easier to work than steel, and you can still solder to it. I built some tube RF decks on 1/16" brass sheet stock, and mounted them into a steel cabinet years ago. -- Michael A. Terrell Central Florida |
#34
|
|||
|
|||
John Bartley wrote:
W7TI wrote: If you're using octal type tubes, there are sockets made for industrial relays which fit the tubes perfectly. They are as you describe; surface mount with side terminals. They no doubt add a small amount of inductance and capacitance which could affect VHF operation, something to keep in mind. McMaster-Carr has them on page 819 of their online catalog: http://www.mcmaster.com/ Very nicely done!!! Thank you. These are the ideal thing for an experimenter. -- regards from :: John Bartley 43 Norway Spruce Street Stittsville, Ontario Canada, K2S1P5 ( If you slow down it takes longer - does that apply to life also?) -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- One thing to watch out for. Relay sockets are not made to run at high temperatures, so you have to make sure they don't melt or burn. -- Michael A. Terrell Central Florida |
#35
|
|||
|
|||
John Bartley wrote:
W7TI wrote: If you're using octal type tubes, there are sockets made for industrial relays which fit the tubes perfectly. They are as you describe; surface mount with side terminals. They no doubt add a small amount of inductance and capacitance which could affect VHF operation, something to keep in mind. McMaster-Carr has them on page 819 of their online catalog: http://www.mcmaster.com/ Very nicely done!!! Thank you. These are the ideal thing for an experimenter. -- regards from :: John Bartley 43 Norway Spruce Street Stittsville, Ontario Canada, K2S1P5 ( If you slow down it takes longer - does that apply to life also?) -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- One thing to watch out for. Relay sockets are not made to run at high temperatures, so you have to make sure they don't melt or burn. -- Michael A. Terrell Central Florida |
#36
|
|||
|
|||
"Michael A. Terrell" wrote in message ... One thing to watch out for. Relay sockets are not made to run at high temperatures, so you have to make sure they don't melt or burn. Yikes!!!!!!!!! Wherever are you going to find temperatures in a receiver that would melt any plastic? Polystyrene miniature tube sockets were used in "UHF" radio receiving projects. Soldering to their contacts took some skill to avoid melting the plastic, but there was no problem during operation. I'll grant you that transmitting firebottles might bother a polystyrene socket. |
#37
|
|||
|
|||
"Michael A. Terrell" wrote in message ... One thing to watch out for. Relay sockets are not made to run at high temperatures, so you have to make sure they don't melt or burn. Yikes!!!!!!!!! Wherever are you going to find temperatures in a receiver that would melt any plastic? Polystyrene miniature tube sockets were used in "UHF" radio receiving projects. Soldering to their contacts took some skill to avoid melting the plastic, but there was no problem during operation. I'll grant you that transmitting firebottles might bother a polystyrene socket. |
#38
|
|||
|
|||
R J Carpenter wrote:
"Michael A. Terrell" wrote in message ... One thing to watch out for. Relay sockets are not made to run at high temperatures, so you have to make sure they don't melt or burn. Yikes!!!!!!!!! Wherever are you going to find temperatures in a receiver that would melt any plastic? Polystyrene miniature tube sockets were used in "UHF" radio receiving projects. Soldering to their contacts took some skill to avoid melting the plastic, but there was no problem during operation. I'll grant you that transmitting firebottles might bother a polystyrene socket. That was what I was thinking. Someone trying to use a sweep tube to build a small transmitter, and having heat problems with the socket. -- Michael A. Terrell Central Florida |
#39
|
|||
|
|||
R J Carpenter wrote:
"Michael A. Terrell" wrote in message ... One thing to watch out for. Relay sockets are not made to run at high temperatures, so you have to make sure they don't melt or burn. Yikes!!!!!!!!! Wherever are you going to find temperatures in a receiver that would melt any plastic? Polystyrene miniature tube sockets were used in "UHF" radio receiving projects. Soldering to their contacts took some skill to avoid melting the plastic, but there was no problem during operation. I'll grant you that transmitting firebottles might bother a polystyrene socket. That was what I was thinking. Someone trying to use a sweep tube to build a small transmitter, and having heat problems with the socket. -- Michael A. Terrell Central Florida |
#40
|
|||
|
|||
Aluminum= nice to work with+very light+dose not rust+not really that
expensive -- http://www.qsl.net/sv1hao "David Forsyth" wrote in message ... Hi all, I recently became interested in trying to build a small two-tube regen type receiver for broadcast and/or shortwave reception. I designed a simple chassis based on some vintage articles on the subject. This is the classic 'metal box with attched front faceplate' design. I was going to use cold-rolled steel since we have this at work and spot weld the face to the main chassis, but then I got to thinking that perhaps the steel might interfere with the coils. I noticed also after this that every old article that I've come across usually suggested aluminum for the chassis. They don't make mention of the reasons for this, however. I was wondering if ease of machinability for the amatuer working with simple hand tools, and perhaps also weight savings, were main factors, or was it mainly for lack of magnetic interation with the coils? We also have sheets of aluminum, brass, and stainless that I can use but I'm not sure if they can be resistance welded, so I would have to bolt the face onto the main chassis box. Anyone have any further ideas or insights? thanks in advance, Dave |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Rare Books on Electronics and Radio and Commmunications | Equipment | |||
Rare Books on Electronics and Radio and Commmunications | Equipment |