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Why all the negativity and double standards in Amp Design

ElectronTubesRule

Active Member
Sep 6, 2011
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Ok so people snatch up Heathkit,Dentron,Drake Amplifiers left right and center int he Ham world. Yet when someone builds a Homebrew amp they always want to hold them to a standard that is higher then most of the gear being used right now and almost all of the gear on Ebay. So what is the deal? Why so much negativity?

So what is the deal why so much negativity and why hold home brew to higher standard then a lot of the manufactures from the past. Chimneys that are not trully needed and sometimes more harm then good, interlock's that are not needed any more then a big sticker saying "Warning do not lick the tube socket with power turned on!" like shunting to ground and such.......All manner of protection circuitry not in most amps that are in use and functioning ust fine in spite of it.

Their is always room for improvement but why poke holes in someone's project when most of them are as good if not better then what was manufactured and sold for so long? Some of the worst designs out their where from huge OEM that are still in Business today like Kenwood and Yaesu....... Some of the worst offenders of less then modern design and less then top notch construction are Ameritron but no one seems to mention that most of their amps are no better then the Heathkit designs or the Homebrew amps built by first time builder's!

All I am saying is that some continuity in standards and such would not hurt! If people are going to go in for the kill and demoaralize a man for his efforts and hard work doing homebrew then they need go after all the OEM that sell less then ideal designs and they need to go after all the stuff that is all the rage on Ebay being bought and sold by their peers. I have seen people vilify a guy for selling a Drake or Tram 10 tube amp but then not say a word about the HeathKit 200,201 or 202............THey go after Black market linears but fail to make the distinction between sound designs and really bad ones. Their are some black market models from days long gone that where everybit as good if not better then some of the stuff Heathkit or Dentron where turning out.

I do not get it really......Why? They tend to leave the big fish in the homebrewing Ham world alone and just go after the small fish..... When popular gear in the hobby from OEM's can not measure up to the standard of the day you have to ask what the standard is for and apply it to all the old gear that can not measure up! Then ask if the standard is even needed or even worth aiming for?

IN Aviation no one poops on a kitplane that is built well as in assembled in a manner that is going to be durable and safe to operate. No one expects a guy working in his garage for 10 years building a plane out of wood or fiberglass to bring a kit plane to the world that has Technology and features found only in Fighter Jet's and Stealth Bomber's!!! I have a lot of hobbies and the only place I have seen nonsense like this is in the Amateur world.

What is my point? Maybe more encouragement, support and a keen interest in these matter's is needed. I think the reason so many people do not bother to post about their projects or send in photo's is because they do not want other's to tear into their project point out all of it's short comings and what is wrong with and then walk away. Constructive criticizim is fine but after you tear something down it is usually a good thing to help build it back up better then before.....

Not pointing any finger's on this site either more of a statement of what I think should be rather then what I have seen so far online!

Once I have some decent progress made will take some photo's but I think their is a lot of projects that go unreported because of the above trend.

I do though think anyone selling an amp should be held to a higher standard then some guy homebrewing in his basement just for his own use!!! I think it is great that people are recyling old parts and also keeping boat anchor's out the scrap pile!!! Too much good stuff get's thrown away today!
 

Off hand I would say they are trying to get away from the "home brew" "cb amplifier" crowd. That and it's typical ham operator BS.
 
well, in a nutshell, its because they are a$$hole know-it-all ham ops.
they never get listened to in the real world so they try to belittle anyone in the radio hobby whenever they see an opportunity.

you all know these guys. they are the ones with whom you start a conversation on the air, and within two minutes you are rolling your eyes looking at your radio saying, "geeez, what a bore!"

remember, you cant be an elitist unless you exclude somebody.
(taken from the 7th grade girls handbook):lol:

LC
 
First off I don't want this thread to become yet another anti-ham or anti-CB'er bullshit thread. There are elitist assholes on both sides of that fence.

Having said that I now offer my opinions on why SOME hams have a problem with HB amps. A lot of HB amps are built by people that have electronics know-how but no construction skills and while a schematic of an amp may look sound the actual construction and layout of parts is a disaster. A lot of amp builders, both CB and ham, have no idea that there is actually a way that the tank circuit components should be laid out in relation to other components in order to reduce stray capacitance or to keep other components out of the extremely strong RF field of the tank circuit.Just because an amp is HB it does not have to look like a piece of shit and regardless of how well it works, if it looks like a piece of shit it shall be judged to be a piece of shit.That applies to just about everything in life BTW and not just amps or radio gear in general. Others have no idea about filtering or bias in the case of solid state amps. That just invites criticism from those that do know about such things.
 
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Funny question.

A few web site "authorities" discourage working with amplifiers simply so they will make more money. Same guys who bad mouth CBers are working on their tube amps for ca$h.

Others are married to manufacturers.

One dude sees nothing wrong with a grid driven 4CX250 for VHF use but thinks 813s are garbage. Why? Because he has no experience with them and he's got the answer for EVERYTHING. Just ask him.

Best example of internetz mis-information is the 3-500Z gas myth. Certain years of those tubes had production problems. Others were never gettered because users thought the orange glow was bad. The guys on the web will tell everyone over and over how your 3-500 is junk if it has not been run every 6 months! Baloney. Watch ebay for happy old and even N.O.S. 3-500Z buyers. Happens a lot.

There is a LOT of second hand information on the interwebz about tube power amps. Plenty of people who read everything but have not actually lit up an amp of their own. Watch out for these people. They always have a guru.

My hat is off to anyone who wants to rip a CB amp apart and make it into a decent machine. The experience is priceless.

OTOH, The comments about high voltage interlocks however are dead wrong. Pun intended.
 
Aren't all CB amps considered "Home-Brew" anyway?

Depends on what exactly you mean by "CB Amps". I have several "10 Meter amps" (old) that were manufactured by the companies of the day that were designed for 10M service.
We all know they will work on 11M. :whistle:
 
Depends on what exactly you mean by "CB Amps". I have several "10 Meter amps" (old) that were manufactured by the companies of the day that were designed for 10M service.
We all know they will work on 11M. :whistle:
I honestly never knew that anyone made a "legitimate" 10 meter only amp back in the day. I thought all of those amps (like my Thunderbolt 305) were just sidestepping the laws so CBers could buy a cheap amp that required low drive and had a SSB/AM switch.
My mistake.
 
There were a lot of dual band amps commercially made that were intended for 10m and 6m. CB'ers started to tune them up on 27 MHz and that helped lead to the FCC's move to ban amplifiers that would operate in the 25-30 MHz range.
 
How about when Browning and Courier marketed their line of "commercial two-way radio amps" for low band 30 to 50 MHz. use (CB with the tank coil modified)? I was always waiting to see one turn up behind a Motorola at some local fire or police department back in the day but it never happened. The funny thing is they all had bias even though they were supposedly intended for FM use while today's CB amps all have SSB switches with very few having bias. What's up with that?
 
Some CB amp makers disguised their stuff as amateur amplifiers.
No really good 6 meter tube amp would have capability on 10 also. The tank values and layout would make it a lousy performer. One special case would be a really complicated mechanical arrangement like the Heath Seneca used on 6 and 2.
For solid state the devices which would work on 6 would drive the price point up.
There just isn't all that much need to amplify 5 watt signals in the amateur radio world. Most transceivers have been in the 100 watt class for over 50 years.
Sure there are a few exceptions.
 

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