[ARC5] Undoing a BC-453 conversion

[Brad Hernlem]

Ian,

"The ARC-5 Repackaged" by K6EUS shows the use of 6H6 as both detector and 
noise limiter (see Command Sets by CQ Technical Series No. 106). I don't 
recall where I got the pdf file of that document but it is 15 MB. Contact me 
off-list if interested.

Brad
KG6IOE

>From: "Ian Wilson" <ianmwilson at earthlink.net>
>Reply-To: ianmwilson at earthlink.net
>To: <arc5 at mailman.qth.net>
>Subject: [ARC5] Undoing a BC-453 conversion
>Date: Wed, 9 Mar 2005 09:52:40 -0800
>
>I recently obtained a BC-453 in quite nice condition, apart from a
>couple of modifications:
>   - Se rectifier + various electrolytics in dynamotor area (I will just
>remove these)
>   - 12H6 instead of 12SR7
>
>I had hoped that the 12H6 simply replaced the one diode of the 12SR7
>that's used. In that case, I would only have needed to restore the
>original connection to the 12SR7 grid. However, the modification appears
>more extensive than this.
>
>Was there a popular modification that used both diodes in a 12H6,
>perhaps for delayed AGC?
>
>I would like to restore the BFO function (and the original detector, I
>guess).
>
>I'm only just starting down the ARC-5 road so would appreciate any
>information.
>I do have access to typical RX schematics, but haven't located one
>specific to the BC-453.
>
>Thanks!
>
>--ian, K3IMW
>
>
>
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