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THE AM BULLETIN BOARD => Technical Forum => Topic started by: G4OJY on September 19, 2021, 12:06:28 PM



Title: Harvey Wells TBS50D
Post by: G4OJY on September 19, 2021, 12:06:28 PM
I've just imported a Harvey Wells TBS50D transmitter from the US. The manual shows that the correct PA tube is an 807, whereas mine has a 6146 fitted. Does anyone know if this was an official modification or not, has it featured in any old radio magazines in the US?

Thanks

Andy G4OJY


Title: Re: Harvey Wells TBS50D
Post by: W3GMS on September 19, 2021, 01:57:13 PM
Hi Andy,

I have never heard that Harvey Wells produced any of the TBS series with a 6146 final tube.  It is more likely that someone who previously owned the rig did the conversion. 

73,
Joe-GMS


Title: Re: Harvey Wells TBS50D
Post by: MikeKE0ZUinkcmo on September 19, 2021, 11:36:53 PM
Agreed, I've never seen one with anything other than an 807 for the PA.


Title: Re: Harvey Wells TBS50D
Post by: N3GTE on September 20, 2021, 09:55:44 AM
Hi Andy

What you are looking for is this: https://www.swedeart.com/harvey/html/bulletins.html Check out #15. Rumor has it that it doesn't make much of a difference between the 807 or 6146.

Cheers
Terry N3GTE


Title: Re: Harvey Wells TBS50D
Post by: Opcom on September 20, 2021, 10:50:02 AM
It almost seems the 6146 was made to honor the 807's ubiquitous usefulness as form factors and vacuum tube technology changed.


Title: Re: Harvey Wells TBS50D
Post by: N3GTE on September 22, 2021, 10:14:31 AM
It's also mentioned in the Swap and Shop article.  https://www.swedeart.com/harvey/html/tbs-50.html

Terry 
AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands