[AMPS] Alpha 76 and 78 tube conversions
Jimmy Jones
jjones@etex.net
Sat, 2 Feb 2002 09:14:57 -0600
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What a deal. You are just like everyone else in the world. You can't do =
it, but it can't be that hard and hell IT'S NOT WORTH ANYTHING.
You should supply the tubes and sockets at no cost for that deal.
N5IFI
----- Original Message -----=20
From: Tom Hix=20
To: amps=20
Sent: Saturday, February 02, 2002 2:05 AM
Subject: [AMPS] Alpha 76 and 78 tube conversions
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.=20
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.=20
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.
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.=20
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.
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.
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.
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.
Thanks for your time and comments will be welcome.
73
Tom Hix..................w4th
Tom's Tubes: Your Russian Tube Connection. Specializing in Amateur =
Amplifier Tubes, Heavy Duty Antenna Tuners, Remote or local ladderline & =
coax antenna switches.=20
http://www.tomstubes.com
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<DIV><FONT face=3DArial size=3D2>What a deal. You are just like =
everyone else=20
in the world. You can't do it, but it can't be that hard and hell IT'S =
NOT WORTH=20
ANYTHING.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>You should supply the tubes and =
sockets at no=20
cost for that deal.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>N5IFI</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:w4th@hotmail.com" title=3Dw4th@hotmail.com>Tom =
Hix</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A href=3D"mailto:amps"=20
title=3Damps>amps</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, February 02, =
2002 2:05=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [AMPS] Alpha 76 and 78 =
tube=20
conversions</DIV>
<DIV><BR></DIV>
<DIV>
<DIV>
<DIV>
<DIV></DIV>
<DIV></DIV>
<P>I dont know if any of you builders have ever paid any attention to =
the=20
Svetlana gi7b/gi7bt triodes, but if you haven't you should. These are =
really=20
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=20
people who own the older Alpha amps like the 76 and 78 series, who =
dont want=20
to pay $1200.00 to $1500.00 to retube their amps. These tubes are =
really heavy=20
duty. A pair of them will give you about 1200 to 1400 watts depending =
on=20
voltage and drive. There is an article on my site about the conversion =
a=20
friend of mine did on an older Dentron amp that ran 4 572b tubes. He =
put in a=20
pair of the gi7b tubes and was able to make a real nice amp out of it. =
He gets=20
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=20
high, I am constantly getting calls from people wanting to know if =
there is a=20
substitute they can get for the 8874 tubes. Of course there are no =
direct=20
replacements, but these gi7b tubes might just be a good choice as =
replacements=20
for the 8874 tubes.</P>
<P>I really hate to see anyone have to rework a perfectly good =
amp like=20
the alpha 76 or 78, but the price on the 8874 tubes =
have gone up so=20
much that you can actually buy a good amp for what it would cost to =
retube=20
these amps. I get calls every week from Alpha 76 and 78 owners =
facing=20
this very situation. Most of them tell me they will just have to stop =
using=20
their amps because they are not willing to spend the money to =
retube=20
their amps. They will either have to set them aside or find =
another tube=20
they can replace the 8874 with. So it is a real dilemma for these =
owners to=20
decide what to do. Turn the amps out to pasture or replace the tubes =
with=20
something they can afford. </P>
<P>I am not an amp builder. I wish I knew a lot more =
about =20
building amps or reworking existing amps, but I am to old, =
fat, dumb=20
and lazy to learn know. BUT.....I know many of you folks on this list =
are the=20
very best at building and repairing amps.</P>
<P>SO..............Here is what I am thinking of doing. Just to see if =
the=20
gi7b tubes can be a decent replacement for the 8874 tubes. If someone =
who=20
knows what they are doing has an amp that has the 8874's in it, and =
they want=20
to change those out and would like to try the gi7b tubes, I will sell=20
you, for my cost, a pair of these gi7b tubes, and a matching set =
of=20
sockets.</P>
<P>The person who wants to do this can take a look at what I send=20
them and determine if the tubes and sockets will physically =
fit into=20
the cabinet. If they will then he can pay me for the tubes and sockets =
at my=20
cost......all I ask is that when the conversion is completed that the =
person=20
who does the work, will send me a schematic of the conversion and a =
full set=20
of pictures detailing each step of the conversion. I want this so I =
can share=20
it on my web site with all the other amateurs who want to change =
out=20
their 8874 tubes to something else like the gi7b. So if you know what =
you are=20
doing, and have a good digital camera and can send me the pictures of =
the=20
project via email, then contact me. I would love to see if this could =
be done,=20
and I know the entire group of older Alpha owners would really =
appreciate=20
finding out if there is another tube they can use, and what it will =
take to=20
make it happen.</P>
<P>If any of you are interested in trying this, just send me a reply =
and we=20
will see what we can work out. I have no idea if any of this is even =
feasible=20
or not, but I sure do wish I could help out these guys with these =
beautiful=20
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>
<DIV></DIV>
<DIV></DIV>
<DIV></DIV>
<P><FONT color=3D#ff0066>Tom's Tubes: Your Russian Tube Connection. =
Specializing=20
in Amateur Amplifier Tubes, Heavy Duty Antenna Tuners, Remote or local =
ladderline & coax antenna switches. </FONT></P>
<DIV></DIV>
<P><A =
href=3D"http://www.tomstubes.com/">http://www.tomstubes.com</A></P>
<DIV></DIV>
<DIV></DIV>
<DIV></DIV>
<DIV></DIV></DIV></DIV></DIV><BR clear=3Dall>
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MSN Photos is the easiest way to share and print your photos: <A=20
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