It's great to see you back Garey! I Hope the recovery is going well. 73,
Terry, W8NJR
In a message dated 9/5/2009 2:21:44 P.M. Eastern Daylight Time,
[email protected] writes:
Phil
Your unit is built to schematic 27500, and should have 6EJ7, 6BA6, and
6BZ6. Earlier units (27000) had the 12V tubes.
73, Garey - K4OAH
Walker wrote:
> I have a TR-4, 1968 manufacture date, serial number 28124. It has worked
> well for years, with the last few being dormant as my vertical took a
> hit a few winters ago with icing. I've replaced the vertical, and I'm
> trying to re-tube the unit. Here is where the confusion arises:
>
> The chassis lettering and schematic for tubes V4, V5, V11 and both agree
> and are respectively: 6EJ7, 6BA6, 6BZ6.
>
> Note: the schematic has V5 and V11 with a hand lettered "6" in front of
> 6BA6 and 6BZ6 versus all other tubes which have stencil guided lettering.
>
> The Manual's Voltage Reference chart and Tube List for V4, V5 and V11
> are: 6EJ7, 12BA6, 12BZ6
>
> The Manual's Block Diagram shows V4 as 6HS6
>
> I'm not sure what's supposed to be right, though I have a tendency to
> believe the chassis lettering and schematic. The manual is internally
> inconsistent, and doesn't agree with the physical hardware or schematic.
> I probably can take out V5 and V11 and measure the filament voltage
> present to see if it really is set up for a 6 or 12 volt tube in those
> sockets.
>
> I found some correspondence between the original owner, whom I purchased
> the unit from, and the factory regarding a technical problem. The
> factory rep wasn't sure in solving a problem whether the former owner
> needed a 6BZ6 or a 12BZ6 so he sent him one of each. Apparently the
> factory didn't know either!
>
> Was there some changeover for different serial number ranges, between
> various tube types or what, and what is the best way to tell which tubes
> really belong in the circuits?
>
> Thanks for pointing me toward a resource, if you know one, to help get
> some answers.
>
> Phil WA2CLX
>
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