[Milsurplus] [ARC5] A.C. Modified BC-348

[Mike Feher]

I have not seen a schematic of this PS. While the 25Z5 was designed and typically used in series string designs, they do not need to be. They are just a rectifier tube and as such can be used in any way the designers decide. 73 – Mike 

 

Mike B. Feher, N4FS

89 Arnold Blvd.

Howell NJ 07731

848-245-9115

 

From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf Of J Mcvey via ARC5
Sent: Saturday, August 28, 2021 10:42 AM
To: arc5 at mailman.qth.net; milsurplus at mailman.qth.net; Hubert Miller <kargo_cult at msn.com>
Subject: Re: [ARC5] A.C. Modified BC-348

 

A 25Z5 implies a "series string/ hot chassis circuit.

The BC348 design does not lend itself very well  to a transformerless power supply.

Then again, Hallicrafters was famous for grounding one side of the AC supply to the chassis!.

This kind of mod is unsafe, IMO.

However, safety did not seem to be a big concern "back in the day"...

 

On Saturday, August 28, 2021, 12:29:46 AM EDT, Hubert Miller <kargo_cult at msn.com <mailto:kargo_cult at msn.com> > wrote: 

 

 

Here's a 348 i found in my stash. The rectifier tube is a 25Z5, which means a drop -in supply with minimum mods. Unfortunately tho, the cabinet top has been aerated. The PS has no markings really except for this on the tube area shield:

"TESTED GOOD 11/10/ 45 ROB". Too early to have hit the surplus stores, so this must be a gov't mod.

-Hue Miller

 

 

 

 

Sent from my Verizon, Samsung Galaxy smartphone

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