Hi All, I found quite a simple schematic for a 50 MHz OSC/Doubler/amp transmitter that uses two tubes; a 6U8 for the osc/doubler, and 2E26/6146 for amp. What...
Bruce - KB6LWN
kb6lwn@...
Jun 18, 2001 12:39 pm
135
Dan, I'm sorry I misinterpreted your question. If you are willing to change the motor mounts and drop in a different larger engine you might consider the 805...
Area31 Research Facil...
rwstephens@...
Jun 18, 2001 12:40 pm
136
... No, Lafayette radios only emit and detect Megacycles. They are immune to ANYhertz Thanks Pres Waterman W2PW c/o Patchogue Motors, Inc. Long Island Ford and...
Pres Waterman
pres@...
Jun 18, 2001 12:41 pm
137
Unless I am mistaken I believe someone posted an address to a site on calculating transformer impedance. Something about applying a known voltage to a winding...
JThompso@...
Jun 19, 2001 1:52 am
138
... Would 7591A's work for ya? They are now in production again, by---Sovtech?? ...first coffee has yet to kick in here. These are not the previous 7591XYZ's....
a175
a175@...
Jun 19, 2001 2:35 pm
139
Hello, The 7591 is a beam tetrode, while the 300BXLS is a directly heated triode. The 7591 won't work at all, neither will it sound as good as the 300B. For...
raymond Woertman
woertman34@...
Jun 20, 2001 9:36 am
140
... Ouch. I stand painfully corrected :-) I'm fairly new at working tubes, picking up some long neglected interests I started as a teen... These guys are the...
a175
a175@...
Jun 22, 2001 5:04 am
141
Hello Steve, Back in the early twenties of the last century, the development of tubes was in a fast lane. The penthode was developed in 1926, but triodes where...
raymond Woertman
woertman34@...
Jun 22, 2001 10:23 am
142
What should I replace those big paper tubes with 4 or so capacitors in them with? What about the other capacitors like the electrolytics? I have a very old...
Peter
cdickjew@...
Jul 18, 2001 12:54 pm
143
Hi Peter, First: replace all the tubes, see if the amp is still loosing power; if not then new tubes will do the trick and its ready for use agian; however if...
Fam. van Oostveen
jaap.oostveen@...
Jul 19, 2001 2:45 am
144
I recently saw a classic Tek tube tracer go for about $1600 on eBay. I got to wondering how much of this value was due to its rarity, and how much to its...
Michael Dunn
mdunn@...
Jul 22, 2001 12:29 pm
145
Michael, Interesting question and one I have thought of. I think that there is a real niche market for such a product but very tiny. I am aware that there ...
Area31 Research Facil...
rwstephens@...
Jul 22, 2001 6:03 pm
146
... Well, I'm not motivated enough to compete against that. Can I say "market saturation"?! ;-) ... That'd be cool, but wouldn't command enough $ to make...
Michael Dunn
mdunn@...
Jul 24, 2001 3:04 am
147
Such a beast already exists. It is a modified Hickok 1234 cardmatic. Info available at: http://tubesontheweb.com/matic.htm Bob Weiss N2IXK...
Bob Weiss
bob.weiss@...
Jul 24, 2001 1:57 pm
148
Thanx Bob. I had a look. Nice idea. I had a chance to buy one of those Cardmatic testers a long time ago and took the cheaper Stark 9-66 instead. Still,...
Area31 Research Facil...
rwstephens@...
Jul 25, 2001 6:03 am
149
Does anyone have a datasheet with curves for the 5933 or now where i can found one?...
Dominique_pifpaf
dominique_pifpaf@...
Jul 26, 2001 12:32 am
150
Dominique, The 5933 is a ruggedized 807 if that helps. I've got samples of both and a side by side examination shows the 807 to have curves (shoulders), the...
Area31 Research Facil...
rwstephens@...
Jul 26, 2001 2:11 am
151
Hello Group, Can anyone tell me if a pair or quad of 6L6 valves will replace the pair 6BQ5's presently used with the transformer I have? Obviously not pin for...
James Thompson
JThompso@...
Jul 28, 2001 1:38 am
152
... Let us know what you come up with. Ken....
Kenneth A. deGruchy, ...
kdegru@...
Jul 28, 2001 10:16 am
153
Jim, If we merely consider plate load impedances, my RCA tube handbook shows the 6BQ5 in push-pull wants a plate-to-plate load Z of 8000 ohms. A pair of...
Area31 Research Facil...
rwstephens@...
Jul 28, 2001 10:16 am
154
... Yipes...replace a pair of EL84's with a quad of 6L6's? You sure will get a lot more power with that set up... whether the OT could handle it, is another...
a175
a175@...
Jul 28, 2001 9:28 pm
155
Thanks for the replies Ken, Steve, Rob, Everything is still in the early stages of development so supply demands can still be considered. Along with 6L6 I...
JThompso@...
Aug 1, 2001 1:57 am
156
Jim, Please be more specific about what type of transformers you are after. I thought you already HAD an output transformer that you wished to use. I have a...
Area31 Research Facil...
rwstephens@...
Aug 2, 2001 2:18 am
157
... Best suggestion, dollarwise, I can think of is "go back to eBay" and look for an amp or PA, complete, that has the tube array that you're looking for (eg,...
a175
a175@...
Aug 2, 2001 2:19 am
158
Rob, I don't think I am going to use this xformer for this project because of the mismatch but will look for other uses. I really need an output xformers that...
JThompso@...
Aug 5, 2001 7:10 pm
159
Does anyone really make any money building vacuum tube amps these days? Looking at some of these posts really brings back some memories. I was a broadcast...
jug48@...
Sep 9, 2001 3:39 pm
160
... I know of one retired electrical engineering professor who is selling vacuum tube preamp kits. He designs the preamps and puts the parts together in a kit...
optom@...
Sep 10, 2001 11:01 am
161
... Hi jug, I've only resumed "looking at" tube amps <from guitar amp side> in the last year or so...it was all put away twenty years earlier for a stint in...
a175@...
Sep 10, 2001 11:46 pm
162
... there ... any ... could ... selling ... making I ... a ... Good idea....never thought about just putting together kits....
jug48@...
Sep 10, 2001 11:46 pm
163
Hi, I am looking for the following 1930's German Valves (for a restoration project) RES164 - this is the 5 pin version (NOT the 4 ping with a side screw ...
