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<P>I dont know if any of you builders have ever paid any attention to the
Svetlana gi7b/gi7bt triodes, but if you haven't you should. These are really
neat tubes, and I can supply them at a great price. </P>
<P>I believe these tubes would possibly be a good solution for many of the
people who own the older Alpha amps like the 76 and 78 series, who dont want to
pay $1200.00 to $1500.00 to retube their amps. These tubes are really heavy
duty. A pair of them will give you about 1200 to 1400 watts depending on
voltage and drive. There is an article on my site about the conversion a friend
of mine did on an older Dentron amp that ran 4 572b tubes. He put in a pair of
the gi7b tubes and was able to make a real nice amp out of it. He gets about
1200 to 1300 watts out on the pair of gi7b tubes. </P>
<P>Since the 8874 tubes for the 76 and 78 series Alpha amps have gone up so
high, I am constantly getting calls from people wanting to know if there is a
substitute they can get for the 8874 tubes. Of course there are no direct
replacements, but these gi7b tubes might just be a good choice as replacements
for the 8874 tubes.</P>
<P>I really hate to see anyone have to rework a perfectly good amp like
the alpha 76 or 78, but the price on the 8874 tubes have gone up so
much that you can actually buy a good amp for what it would cost to retube
these amps. I get calls every week from Alpha 76 and 78 owners facing this
very situation. Most of them tell me they will just have to stop using their
amps because they are not willing to spend the money to retube their amps.
They will either have to set them aside or find another tube they can
replace the 8874 with. So it is a real dilemma for these owners to decide what
to do. Turn the amps out to pasture or replace the tubes with something they
can afford. </P>
<P>I am not an amp builder. I wish I knew a lot more about
building amps or reworking existing amps, but I am to old, fat, dumb
and lazy to learn know. BUT.....I know many of you folks on this list are the
very best at building and repairing amps.</P>
<P>SO..............Here is what I am thinking of doing. Just to see if the gi7b
tubes can be a decent replacement for the 8874 tubes. If someone who knows what
they are doing has an amp that has the 8874's in it, and they want to change
those out and would like to try the gi7b tubes, I will sell you, for my
cost, a pair of these gi7b tubes, and a matching set of sockets.</P>
<P>The person who wants to do this can take a look at what I send them and
determine if the tubes and sockets will physically fit into the cabinet.
If they will then he can pay me for the tubes and sockets at my cost......all I
ask is that when the conversion is completed that the person who does the work,
will send me a schematic of the conversion and a full set of pictures detailing
each step of the conversion. I want this so I can share it on my web site
with all the other amateurs who want to change out their 8874 tubes to
something else like the gi7b. So if you know what you are doing, and have a
good digital camera and can send me the pictures of the project via email, then
contact me. I would love to see if this could be done, and I know the entire
group of older Alpha owners would really appreciate finding out if there is
another tube they can use, and what it will take to make it happen.</P>
<P>If any of you are interested in trying this, just send me a reply and we
will see what we can work out. I have no idea if any of this is even feasible
or not, but I sure do wish I could help out these guys with these beautiful old
amps.</P>
<P>Thanks for your time and comments will be welcome.</P>
<P>73</P>
<P>Tom Hix..................w4th<BR><BR><BR></P>
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<P><FONT color=#ff0066>Tom's Tubes: Your Russian Tube Connection. Specializing
in Amateur Amplifier Tubes, Heavy Duty Antenna Tuners, Remote or local
ladderline & coax antenna switches. </FONT></P>
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<P><A href="http://www.tomstubes.com/";>http://www.tomstubes.com</A></P>
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