上海11选五开奖直播


GS-35B
Triode Grounded Grid Linear Amplifier Project
For Amateur Radio by W4ZT
(Latest update done on July 6, 2008)
WARNING! DANGER! HIGH VOLTAGE!
This project uses dangerous high voltages.
These voltages will not just shock you, they will kill you.
Use extreme caution while building, working on and testing.
Always THINK SAFETY! Only YOU can prevent accidents.

Circuits
Construction
HF
Links
Mail Archive
Parts Lists
Q & A
Tube Data

VHF, UHF, SHF

GS-35B "The Ugly Russian"
Manufactured at the "Souz" (Union) factory in Novosibirsk,
Russian
GS-35B
Medium mu triode vacuum tube

Tony's first rule for tubes:
Tubes are like women... If you feel that you must have two, keep them in separate houses, and don't let them know about each other. If one isn't good enough for you, get a better one.
In other words, if one tube isn't enough for you, don't run two, get a bigger tube!
The next logical step above a single GS-35B isn't two of them... it is a single YC-156

Pozy's first rule for building home brew amplifiers ():
"If your amp is going to require more than 100 Watts of drive, you need to get a different tube."
My Own Links and General Amp Information:
  • W4ZT - This is my GS-35B tube socket or mounting fixture design. It virtually eliminates the stray inductance in the grid circuit. Click on the picture to see the details of the construction. The socket to the right has my in place.

    I make and sell Sockets, PTFE Chimneys and Bias Boards:
  • CAUTION: I have documented proof that there is a problem using PVC as a chimney. CLICK HERE for pictures and more information.
  • - Here's my answer to cooking the tubes for days and then testing them before inserting them in an amp. Note - I have learned an important lesson with this jig. The filament alone heats the entire bottom of this tube and even with the fan blowing air into the box, the bottom of the tube will get too hot to hold in your hand. This is an important lesson regarding cooling of the tube, particularly the grid ring and filament seals.
    Do
    NOT run this tube without air, lots of air, blowing around its base and through the anode cooler. There is 38 watts of heat from the filament alone. W4ZT
  • - Pictures of GS-35Bs glowing in the dark producing a rainbow of color. Do yours glow? My bet is that they do. What color are they? Want to share your pictures?
  • Schematic of the GS-35B Amp - An effective simple schematic.
    NOTE: Do NOT use a center tap filament transformer. To do so leads to unbalanced currents in the filament choke and hum modulation of the RF output. Instead, use a separate cathode choke. Note that the filament choke can be made with two 48" long pieces of #18 wire bifilar wound to fit on a 3.5" length of 3/8" ferrite rod. The cathode choke can be one 48" length of #18 wire on a 1.5" length of 3/8" ferrite rod. Both chokes are about 25 to 30 uH. Be careful to wind the chokes on a metal rod slightly smaller than the ferrite and then move them to the ferrite rod to prevent breaking the ferrite.
  • Show and Tell GS-35B Amp - built big and open to show everything inside except the cathode compartment. A work in progress.
.
Tubes, Parts, Information and Sources:
  • - Allen Bond has Vacuum Relays, Vacuum Variable Capacitors, Turns Counters, Fiberglass and many other hard to find RF Transmitting Components. High quality components and the best service:
  • - GS-35B Tubes via Texas or direct
    Nice new old stock tubes in the foam box available at reasonable prices plus shipping charges from Russia. He also has the GI-7B, a large selection of vacuum variable caps, vacuum relays and other parts for the QRO builder.
  • Payment and shipping can be made in the U.S. via storage in Texas.
    http://qro-parts.com/

  • - Frank's got a huge resource of tube data:
  • L/C Meter - If you are going to be building an amp, this tool is invaluable. You need to be able to know what value your capacitors and inductors are and to be able to wind coils as needed:
    http://aade.com/lcmeter.htm
  • - Supplier of tubes and other components:
  • W4TH - Tom Hix - TomsTubes in Boaz, Alabama
    Tom passed away in December 2006 and Tom's Tubes is no longer supplying tubes.
    Rest In Peace old friend.
  • - A good listing of many Russian Tubes, specs etc.
  • - David has a nice collection of tube data sheets and lots of other amplifier and electronics information:
  • - carries a huge selection of tubes, sockets and other components from Russia:
  • - Paul sells a triode control board, a digital meter display, a tuned input board and other components:



    (
    old address - http://wd7s.home.att.net/triode_control.htm)
  • - Ian sells a triode control board and a tetrode control board too:

  • - Russian Tubes, specs, sales etc.
  • - Matt has lots of amp builder stuff on his site. Makes for some excellent reading and well worth your time.
  • Please take the time to read his amp builder document here:
  • AC6V's Tech Ref
  • WB0NNI - Amp design for tetrodes but LOTS of good information. This site is loaded to the gills with good stuff.
    (N4JML)Amplifier basics including vacuum tube basics, "Good stuff for amp beginners like me" Rick:
    (KC4HYM)
  • Be sure to click the link for Grounded Grid Basics too:

  • KD9JQ - Ham Radio Page for Homebrewers
    Was at this address http://mywebpages.comcast.net/kd9jq/hamradio/kd9jq.html but Chuck changed his ISP to MSN. MSN wants you to sign up to view his pages so they are no longer available by direct link. You can still view this page by using the Wayback Machine at which will take you here:
  • Triode Amplifier Program - design your own
    Chuck's program was here http://mywebpages.comcast.net/kd9jq/hamradio/TAP.html but now can only be seen by using the Wayback Machine at which will take you here:
  • AG6K - Rich has lots of amp building info on his site. Years of experience and knowledge to share. See the pictures of the ugly amps, etc. There's a great multi-part article on amplifiers that he put together for the ARRL Handbook. Read, if you dare, about Richard Measures' clash with ARRL over his writing about amps, advertiser control of QST and other interesting stuff. (W4BD)
  • F1FRV - Dominique has nice logic, control and metering circuits and cards and lots of other amplifier info including pi-networks and testing of tubes.
    (click on Linear Amps)

Other than by band, these links are provided in no particular order. Thanks to everyone for your links!
(click on the links or the pictures for more information)
HF Amps:
  • Schematic of the GS-35B Amp - An effective simple schematic.
    NOTE: Do NOT use a center tap filament transformer. To do so leads to unbalanced currents in the filament choke and hum modulation of the RF output. Instead, use a separate cathode choke. Note that the filament choke can be made with two 48" long pieces of #18 wire bifilar wound to fit on a 3.5" length of 3/8" ferrite rod. The cathode choke can be one 48" length of #18 wire on a 1.5" length of 3/8" ferrite rod. Both chokes are about 25 to 30 uH. Be careful to wind the chokes on a metal rod slightly smaller than the ferrite and then move them to the ferrite rod to prevent breaking the ferrite.
  • Show and Tell GS-35B Amp - built big and open to show everything inside except the cathode compartment. A work in progress.
  • eHam.net - Other hams review the GS-35B. W2APE swaps out an 8877 with a GS-35B in his Harris AM-7224/URC. After a few changes he is highly pleased with the update:
  • W4EMF - Lawson's beautiful GS-35B amp :


    More of Lawsons fine amplifier work including several retrofits to the GI-7B:
  • W5RR - Doug's nice retrofit of a Henry 2K
  • VK3ZL - Bob built this beautiful GS-35B amp from scratch and it really looks nice. Detailed photos from start to finish:
  • N9ADG - Brian's retrofit of the BTI LK-2000 to the GS-35B. He uses the W4ZT Bias Board
  • N9ADG - Brian's retrofit of the AL-1200 to the GS-35B. He uses the W4ZT Bias Board
  • N3SVB - Keith's GS-35B build using the W4ZT socket and bias board
  • KI4X - Mike made this retrofit of the AL-1200 amplifier:
  • IZ0CGA - Alessandro made this retrofit of the QROTEC HF-100 amplifier using the W4ZT socket and Teflon chimney:
  • PA3AOT & PA3CXQ - A beautiful home made socket following my socket design :
  • 9A5BSS - Sinisa has crafted this beautiful socket for his amp.
    I look forward to posting more pictures as he progresses:

  • WB8WJU - Tom has built many GS-35B amps and has lots of pictures and info on his site. He's always very helpful. He also sells a socket for the GS-35B:
  • VK8RH
  • DF1HF - Power supply
  • Challenger Amp - Note the construction in the commercially built GS-35B amplifier. See the under chassis view showing the tuned input (see the link on the discussion page at my site too):
  • WB0NNI - Amp design for tetrodes but LOTS of good information. This site is loaded to the gills with good stuff.
    (N4JML)Amplifier basics including vacuum tube basics, "Good stuff for amp beginners like me" Rick:
    (KC4HYM)
  • Be sure to click the link for Grounded Grid Basics too:

  • W2CQM - An 8877 triode amp but lots of good construction info including power supply details:
    (N4LR)
  • ON4SKY - Selecting a tube HF amp and other technical details:
    (N4LR)
  • KD9JQ - Ham Radio Page for Homebrewers
  • Triode Amplifier Program - design your own
  • F1FRV - Dominique has nice logic, control and metering circuits and cards and lots of other amplifier info including pi-networks and testing of tubes.
    Main page - (click on Linear Amps)

  • I5UXJ - Taking the GS-35B to high levels, this 3 tube amp delivers 6000 watts output with 250 watts drive. Just goes to show you what can be done if you're into it! See it at:

 
Using the GS-35B on other bands:
GS-35B Amps on VHF, UHF and SHF Click Here
GI-7B and other Other Interesting Tubes
 
*Teflon® is PolyTetraFluoroEthylene (PTFE)
PTFE is a fluorocarbon-based polymer. It is commonly called Teflon® which is the registered trademark of DuPont. PTFE is also manufactured by other companies. It is available with or without filler materials to meet specific needs. The PTFE used here has no fillers and is called "virgin PTFE".
 
Spammers, please add these addresses to your list as they need all the email they can get (they are known to send spam email themselves: - dbirdsley@tds.net info@hamthreads.com

WARNING! DANGER! HIGH VOLTAGE!
Your safety is YOUR responsibility. The information provided here is for information purposes only. No liability is assumed by providing you with this information.

Please work safely. If you don't feel safe, step back and avoid the danger.
  • Don't work on this kind of project while you are tired. Don't work alone.
  • Don't work with the power on!
Remember, capacitors store energy and they can deliver a dangerous shock long after the primary power source has been removed. Keep one hand in your pocket.
Better still, keep BOTH hands in your pockets :~)

This page was started February 11, 2004 and the last update was on July 6, 2008.

my response to a nasty email from n4ja

 

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