[ARC5] BC-454-B Power

[Brian Clarke]

Not such a good idea, Ken.

 

This idea of substituting 6 V tubes really only works if all the heaters are
in parallel. 6SK7, 6K8, 6SR7 all require 6.3 V @ 0.3 A. The 6V6 heater
requires 0.45 A.

 

Further, the 6V6 is not a good match for anode load; a far better match, and
available in metal with the same pin-outs as the 12A6 and 6V6, is the 6F6,
anode load 7 k Ohm , but heater current 0.7 A.

 

73 de Brian, VK2GCE

 

From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On
Behalf Of Kenneth G. Gordon
Sent: Monday, 19 July 2021 2:24 PM
To: 'MICHAEL BITTNER'; arc5 at mailman.qth.net; Robert P. Meadows
Subject: Re: [ARC5] BC-454-B Power

 

On 18 Jul 2021 at 21:16, Robert P. Meadows wrote:

 

> How about checking the wiring against a proper schematic.  Then you will

> know.  First check the tubes.  A quick change to 12v filaments is to
install

> 6 v filament tubes.   Not hard R

 

Use a 6V6 in the 12A6 socket. Base diagrams are identical: 8AC

 

Ken W7EKB

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