To: | [email protected] |
---|---|
Subject: | Re: LF: Better picture of the 807 based 500kHz TX |
From: | Dimitrios Tsifakis <[email protected]> |
Date: | Wed, 19 Dec 2012 09:14:44 +1100 |
Dkim-signature: | v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=o9ZbmrV6Kmy2UtUAJZAeb+mYMGZgmsprYpzlfKwLOBc=; b=ZJTDDoJ/8QhlNup2FhXyn4ejmTLj3i8Q0gYWjYzRRxWYVkZyjXXIH2j8VEN9hBSDTl ylVc8VjJZKUMHpUD/giz/5+MeGT6OZ8DKS3WwQDdR9yfo3ZMYt2wm9FWUi+9ZbVmEafo lTpqoqGLJYcZao+DUfq5q53Kp70BiQezOFpBQ0tCqsNZT71ZGk+kUKOdQYuo8g0II/xZ BjUZdTPNQuM/gZzQK0Celcl6FG3/2NVu0tEZzfu3JjNZ8j9LARQQR46paJhLoHmdYlKR 4SAF72ddKsC4tjYfuygkdQw4A0vIXrFsDVh9lI5gXYjqhlOVxtvktmqM1sg/6uY+eLL+ Ui3A== |
In-reply-to: | <[email protected]> |
References: | <CAKvcm2d8JffcrF9E7MojDPtEZVaJGTwxiX6yU0dWUUs0tYYuWQ@mail.gmail.com> <[email protected]> <CAKvcm2cgFMiw2fkhCXvh+op-35cxQX65F3GsNM7bBEgKee_3QQ@mail.gmail.com> <[email protected]> <CAKvcm2cwH8j7yVD2p+Qd+EcrMbzURfzbYFe_0K688-F75vBTjQ@mail.gmail.com> <[email protected]> <CAKvcm2evEerTZqS07BZTUD8acksEv34vLApYU3wnCOGEDHSYMQ@mail.gmail.com> <[email protected]> |
Reply-to: | [email protected] |
Sender: | [email protected] |
Hi Stefan, I am also not part of the tube generation (born in the seventies) but I am fascinated by them! While a class-E PA is a very sensible and efficient PA, tubes (or valves) have a different kind of appeal to me. My 40 m transmitter is based on more than 50% recycled material which dates back to the 40s and 50s. The knobs and panel meters are from an old 30 kW AWA ISB transmitter. The 807 I am currently using (not the one in the photos) is an old soviet one, the 6CL6 comes from an old TV, the sockets from an old amateur boat anchor etc... Anyway, I do plan to use a class-E PA for my QRSS transmissions on LF/MF ;-) 73, Dimitris 2012/12/19 Stefan Schäfer <[email protected]>: > Hi Dimitris, > > Tubes for PAs is not my world (generation) but the topic is most interesting > and the webpage too. > > Good luck and i hope to see some traces from you some time, at constructive > QSB :-) > > 73, Stefan/DK7FC > > Am 18.12.2012 22:07, schrieb Dimitrios Tsifakis: > >> By the way, here is my current 40 m 807 transmitter.This was the first >> attempt at building a valve TX. >> >> people.physics.anu.edu.au/~dxt103/valves/807/ >> >> I will use the same type of chassis for the 472 kc version but I will >> use an old 450-0-450 (50 mA), transformer which also has a 225-0-225 >> and 6.3 windings, for a more compact result. My hope is that I can >> draw a bit more than 50 mA without overheating the transformer and is >> based on the fact that CW is not 100% duty cycle and also I am not >> using the other windings to their maximum current ratings. >> >> 73, Dimitris VK1SV >> > > |
Previous by Date: | Re: LF: Better picture of the 807 based 500kHz TX, Stefan Schäfer |
---|---|
Next by Date: | Re: LF: OP32 136KHz TA Opportunity VO1NA 2100 UTC onwards 18 Dec, Graham |
Previous by Thread: | Re: LF: Better picture of the 807 based 500kHz TX, Stefan Schäfer |
Next by Thread: | Re: LF: Better picture of the 807 based 500kHz TX, Graham |
Indexes: | [Date] [Thread] [Top] [All Lists] |