DIY Audio Projects Forum
 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

DIY Audio Projects Forum

Welcome to the DIY Audio Projects Message Forum. Use these forums to discuss Hi-Fi audio and to share your DIY Audio Projects. Registration is free and required to post messages and view the file attachments. Registration will only take a minute and registered users do not see any advertisements. After you have completed the online registration process, check your email (including spam/junk folder) for the verification email to activate your account. New members are under moderation - so your posts will not be visible until approved by a moderator. See the Read Me 1st, Forum RULES and Forum FAQ to get started on the forum.

It is currently 09 Aug 2020, 06:12

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 13 posts ]  Go to page Previous  1, 2
Author Message
 Post subject: Re: 50 watt tube linear
PostPosted: 07 May 2018, 09:47 
Offline
User avatar

Joined: 23 Feb 2011, 16:31
Posts: 79
Location: Berlin / Germany
Hi there,

here the site of a Dutch pirate with many transmitter kits and circuits. Looking for the table" ZENDERS & MODULATORS"
http://members.home.nl/radiomorningstar/index1.htm

For CW with little effort the Ameco AC1 from the 50s. 40m 80m
http://www.wa8ywo.com/Ac1.html

joe


Top
 Profile  
 
 Post subject: Re: 50 watt tube linear
PostPosted: 22 Feb 2019, 01:16 
Offline
User avatar

Joined: 22 Feb 2019, 01:04
Posts: 25
Location: Bruce Street, Auckland, New Zealand
Is the launcher made by oneself?

_________________
Electron tube,Old radio,Open recorder,Vinyl record,Tape recorder


Top
 Profile  
 
 Post subject: Re: 50 watt tube linear
PostPosted: 11 Jan 2020, 17:45 
Offline

Joined: 11 Jan 2020, 00:03
Posts: 2
I know I am coming in late on this discussion but, I have some thoughts. Looking at your transmitter, I am assuming a MOPA transmitter that is screen modulated. 6AG7 oscillator with a 6L6GC PA and a 6SN7GT mic pre and screen modulator. Screen modulation is normally kind of thin sounding and 65% is about the best you can do undistorted. So I was thinking you could add another tube a choke and misc other parts and have Heising modulation which will allow the rig 100% modulation plus, you could also add controlled carrier which would turn the carrier down during no modulation. I have been a HAM for the better part of 55 years and this is some of the tricks that HAMs did in the 50s and 60s to get more punch out of their mobile rigs, I got in at the end of the A,M, dynasty when there was nothing on 2 meters but A.M. and that was sparse. Another suggestion would be whatever amplifier you decide on, make it grounded grid. THey are some much easier to build and you have virtually no neutralization problems. The 6146 in particular can be a hand full even in the best design. When you are going to use a linear to boost an A.M. transmitter it is best to have one that is capable of 3 time what you want as the final output. A.M. is very high duty cycle so, you want plenty of headroom. If you are interested, let me know and I will put together some information for you. Oh yes there is one more thing... You can have a clean signal with over 100% modulation but, you have to limit the negative peaks because it is the negative peaks that cause to output to go past cutoff which makes them go non-linear...
Best Regards,
James
N7XSN


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 13 posts ]  Go to page Previous  1, 2

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
DIY Tube Projects :: DIY Tube Amp Kits :: DIY Speaker Projects :: DIY Solid State Projects :: DIY IC / Op-amp Projects :: DIY Phono Projects :: DIY Cable Projects :: Hi-Fi Audio Schematics
© diyAudioProjects.com - Terms of Service - Privacy Policy