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Title: The 807 in Push-pull Post by: IZ0MFI on January 14, 2013, 11:50:08 AM Hello,
In last weekend i've ended and fired up my selfmade ultimate AM golddays transmitter builted around two couples of 807' beam tetrode in Push pull configuration 8) This tx use a classic line-up with e.c.o. oscillator (6an8) followed to doubler (6ba6) and 6T6 quadrature driver (instead of 6V6 tube). The two 807 delivers more of 75 watts of carrier supplied at 700 vdc and good AM linearity even with 100% of modulation from others 807 p.p. in AB2 class and ART-13 modulation transformer. The RF pa stage have variable link coupling to the out with very smooth tuning and no any spurious product even without any neutralization. 73' Marco IZ0MFI Title: Re: The 807 in Push-pull Post by: IZ0MFI on January 14, 2013, 11:52:12 AM More pics ;D
Title: Re: The 807 in Push-pull Post by: KB2WIG on January 14, 2013, 12:17:59 PM M,
She looks really nice. klc Title: Re: The 807 in Push-pull Post by: W7TFO on January 14, 2013, 01:13:19 PM Sweet! :D
73DG Title: Re: The 807 in Push-pull Post by: N0WEK on January 14, 2013, 01:18:31 PM Very nice layout and construction!
Do you have a schematic to share? Title: Re: The 807 in Push-pull Post by: KK4RF on January 14, 2013, 01:47:58 PM Beautiful work. I wish my projects could look that good! ---Marty, KK4RF---
Title: Re: The 807 in Push-pull Post by: N8LGU on January 14, 2013, 02:16:08 PM Beautiful work, Marco!
Title: Re: The 807 in Push-pull Post by: W2PFY on January 14, 2013, 03:19:52 PM Nice to see all this interest in the 100-150 watt class of modulators and transmitters.
I'm still stuck in the Hi Power mode but as I get older, light weight stuff is becoming more appealing! That is really nicely put together, you get three ;D ;D ;D Title: Re: The 807 in Push-pull Post by: KA2DZT on January 15, 2013, 12:37:56 AM Nice work, very good construction.
How long did it take to build?? Fred Title: Re: The 807 in Push-pull Post by: IZ0MFI on January 15, 2013, 08:47:44 AM Thank You very much guys, AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
I am very honored :D to receive the compliments of this famous and active net! Sorry but the general wiring diagram is not 'available because it' s really very classic derived from the various suggestions of some ARRL Handbook (1941,1959,1966..) I hope to...may be in the next. This work is ben retailed from the normal social life of a father of three kids with a wife who works ;-) (pool, gym, music, school commitments and, of course, my work until 6 pm) and lasted approximately 2 months excluding the procurement of vintage components :P. 73' Marco |