-
W4ZT
Socket
 - 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 *Teflon® Chimney in place.
You can make this socket using ordinary hand tools without special
skills or materials. There is no lathe work required for this
design. If you are handy with hand tools you can construct this
socket yourself. Or, I can build
one for you!
|
|
- CAUTION: I have documented proof that there is a problem using PVC as a chimney. CLICK HERE for pictures and more information.
|
|
- Tube Tester and Filament Burn In Jig - 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 computer 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
|
|
- GS-35B Tubes Glow In The Dark! -
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.
|
|
|
|
. |
- Max-Gain
Systems - 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: http://www.mgs4u.com
|
|
- 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:
|
|
- GS-35B Tubes via Texas or direct - has a surplus of 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 Mats, KD5FZX, in Texas. Please use this email form to contact:
https://www.cryptoheaven.com/ch/web-mail-frame.jsp?uId=2219428
|
|
|
|
|
- Almost All Digital Electronics 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
|
|
- VK3ZL - Bob built this beautiful GS-35B amp from scratch and it really looks nice. Detailed photos from start to finish:
http://vk3zl.gs35b.com
|
|
- IZ0CGA - Alessandro made this retrofit of the QROTEC HF-100 amplifier using the W4ZT socket and Teflon chimney:
http://iz0cga.gs35b.com
|
|
- 9A5BSS - Sinisa has crafted this beautiful socket for his amp.
I look forward to posting more pictures as he progresses:
http://9a5bss.gs35b.com
|
|
|
|
- W4TH - Tom
Hix - TomsTubes in
Boaz, Alabama
- Tom sells tubes, sockets, the GM3SEK (G3SEK) triode control
board and many other products.
http://www.tomstubes.com/
|
|
|
|
|
- G8WRB - David has a nice collection of tube data sheets and lots of other amplifier and electronics information:
http://www.g8wrb.org/
|
|
- GS Tube.com
- carries a huge selection
of tubes, sockets and other components from Russia:
http://www.gstube.com/
|
|
|
|
|
|
|
- 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:
http://home.comcast.net/~wb8wju/
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
- 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):
http://www.lauk.karoo.net/hf_amps.htm
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
- 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)
http://www.somis.org/
|
|
- F1FRV
- Dominique has nice logic, control and metering circuits and
cards and lots of other amplifier info. At first I had a problem
loading his page because it required Internet Explorer but this
has been fixed.
Main
page - http://f6kbf.free.fr (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:
http://i5uxj-2.cln.it/amp/amphf1/amp1.html
|
|
