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traneus
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hot-chassis AC-DC tube radios
traneus   11/11/2015 12:27:53 PM
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Some AC-DC tube radios were wired so that the chassis was connected to one side of the power plug when turned on, and to the other side of the power plug when turned off. One side of the plug connected to the power switch. The other side of the power switch was connected to the chassis. The heater series string was connected from the chassis to the other side of the plug.

I recapped and rewired one of these to run safely and cooly off a 12 VAC 1A wall-wart supply.

I rewired the small-signal tubes (12BE6, 12BA6, 12AT6/12AV6 or 12SA7, 12SK7, 12SQ7) with their 12 V heaters in parallel across the 12 VAC. I used three silicon rectifiers to triple the 12 VAC to 36 VDC for B+ for these tubes. The gain is lower, but they work fine. I removed the rectifier tube (35W4 or 35Z5)  entirely.

I relpaced the audio output tube (50C5 or 50B5 or 50L6) and output transformer with a LM384 running from 12 VDC (halfwave-rectified 12 VAC). I used a resistive divider at the LM384 input to reduce the gain to the unity voltage gain exhibited by the audio output tube and transformer. I reused the output transformer primary as a filter choke for the 36 VDC supply filter.

Max The Magnificent
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Re: Andy Capp
Max The Magnificent   6/4/2014 3:38:44 PM
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@Stargzer: The picture doesn't show on my PC, but I don't know if it's our net-nanny software or not.

It shows on mine when I click your link...

 

Max The Magnificent
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Re: Manuals
Max The Magnificent   6/4/2014 3:36:47 PM
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@perl_geek: Check the links in my earlier posting. That's why I put them in.

I'm going to -- just as soon as a get a moment to draw breath :-)

perl_geek
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Manuals
perl_geek   6/4/2014 3:29:37 PM
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Check the links in my earlier posting. That's why I put them in.

Stargzer
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Re: Andy Capp
Stargzer   6/4/2014 12:53:51 PM
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@David Ashton: "(Andy Capp was a working-class British layabout forever shirking work, drinking beer and chatting up barmaids, and a cigarette hanging out of his mouth).  He had a long suffering wife called Flo who had cleaning jobs to bring in a bit of money."

Andy resides at gocomics.com.  Here's today's story:

 

Edit: The picture doesn't show on my PC, but I don't know if it's our net-nanny software or not.

Max The Magnificent
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Re: Mysterious Object
Max The Magnificent   6/3/2014 9:45:12 AM
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@kfield: You mean you were pouring it directly down your gullet, bypassing your lips entirely?

Hey -- I'm not gauch -- my mom brough tme up propper -- I know which color drinking straws and which paper umbrellas go with each type of cocktail -- and when it comes to a formal dinner in which white, red, and dessert wines are served with each course, I know that you use the drinking straws starting from the outside -- LOL

Max The Magnificent
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Re: Mysterious Object
Max The Magnificent   6/2/2014 5:59:24 PM
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@kfield: ... but you do understand it's a joke -- right?


Otherwise how would I have been able to suck up any that accidentally sloshed onto the table? LOL

Max The Magnificent
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Re: Mysterious Object
Max The Magnificent   6/2/2014 5:58:02 PM
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@kfield: You mean you were pouring it directly down your gullet, bypassing your lips entirely?

Well, that's the underlying meaning when you say "alcohol never touched my lips" ... but you do understand it's a joke -- right?

kfield
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Re: Mysterious Object
kfield   6/2/2014 5:48:56 PM
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@Maxthemagnificent  You mean you were pouring it directly down your gullet, bypassing your lips entirely?

Max The Magnificent
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Re: Mysterious Object
Max The Magnificent   6/2/2014 4:56:20 PM
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@David: But she has not let me forget that.

Strange how wives and mothers forget all of the good things you do, but you blow up one lousy garage and...

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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