[ARC5] BC-453 drift test

[J Mcvey]

I hope they send a data sheet and schematic with those.There needs to be a low pass filter which seems to missing...Every modern TV uses this technology, so it's tried and true.
Look Ma! No heatsinks! Extremely low fail rate too.
 

    On Thursday, January 11, 2018 9:52 AM, David Stinson <arc5 at ix.netcom.com> wrote:
 

 #yiv4326692636 #yiv4326692636 -- _filtered #yiv4326692636 {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;} _filtered #yiv4326692636 {panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv4326692636 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv4326692636 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}#yiv4326692636 #yiv4326692636 p.yiv4326692636MsoNormal, #yiv4326692636 li.yiv4326692636MsoNormal, #yiv4326692636 div.yiv4326692636MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;}#yiv4326692636 a:link, #yiv4326692636 span.yiv4326692636MsoHyperlink {color:blue;text-decoration:underline;}#yiv4326692636 a:visited, #yiv4326692636 span.yiv4326692636MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv4326692636 span.yiv4326692636EmailStyle17 {color:#1F497D;}#yiv4326692636 .yiv4326692636MsoChpDefault {font-size:10.0pt;} _filtered #yiv4326692636 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv4326692636 div.yiv4326692636WordSection1 {}#yiv4326692636    From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On Behalf Of J Mcvey via ARC5
Subject: Re: [ARC5] BC-453 drift test  The reduced B+ may be a good idea, but these radios are running on the original dynamotors.  On that theme, I was considering building fet and mosfet substitute solid state replacements into octal sockets for plug-in replacements.Then I run the B+ on 24V.The only problem will be getting audio power out of  the audio output section.One rube-goldberg setup might be using a standard audio power IC and a matching transformer  to match the original plate impedance.A less bulky idea might be to have a local voltage boost for the 12A6 tube only, which will supply 100v or so to a push pull power amp.Fortunately the 24V can be picked off of the 12a6 heater pin.  Any other ideas?----------------------------------  I’ve recently acquired some of these teeny Class D audio amps, similar to these:
https://www.ebay.com/itm/222596016494About the size of a postage stamp, but have not yet started to experiment with them.
Search “class d audio” for many options.Anyone else?      ______________________________________________________________
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