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Old 5th February 2006, 11:19 PM   #1
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Default The first pocket transistor radio

for your Sunday evening enjoyment, during halftime for the Superbowl:

http://people.msoe.edu/~reyer/regency/
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Old 5th February 2006, 11:23 PM   #2
anatech is offline anatech  Canada
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Hi jackinnj,
Cool

I have a portable transistor radio from 1959 in it's original box with manual. I'll post a pic if I can find it.

-Chris
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Old 6th February 2006, 01:13 AM   #3
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Default Re: The first pocket transistor radio

Quote:
Originally posted by jackinnj
for your Sunday evening enjoyment
Hi jackinnj

Thanks for the link and I remark , how lucky we are in present times.Look at the data sheet of this TI transistor...

-current amplification factor ( minimum ) - 0,9

http://people.msoe.edu/~reyer/regency/ti_ad_11-53.jpg
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Old 6th February 2006, 01:50 AM   #4
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Default Re: Re: The first pocket transistor radio

Quote:
Originally posted by Tube_Dude
-current amplification factor ( minimum ) - 0,9
Hehehe. And I like this from the TI information bulletin:

The transistors - technically known as n-p-n grown germanium triodes - are made in the Semiconductor Products Division

I've always said transistors are triodes too!

And just look at this output stage:

Click the image to open in full size.

It's a germanium SET amp!

se
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Old 6th February 2006, 01:54 AM   #5
anatech is offline anatech  Canada
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Hi Steve,
You just started the next revival. Everyone knows true class "A" is the best sound.

Remember the old EV PA amps in the early 70's? Classic class "A", germanium output transistors. Nice coming in from the cold in the winter.

-Chris
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Old 6th February 2006, 02:00 AM   #6
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Default Re: Re: Re: The first pocket transistor radio

Quote:
Originally posted by Steve Eddy


I've always said transistors are triodes too!


It's a germanium SET amp!


Triodes only for the 3 terminals , because the impedance "looking" in the collector of the transistor is very high ( hundreds of KOhms ) it look more , like a pentode .

In the schematic you provide (without feedback) , we have a transconductance output stage and the speaker is in current drive mode ...
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Old 6th February 2006, 02:01 AM   #7
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If germanium devices got more than a little warm they died.
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Old 6th February 2006, 02:06 AM   #8
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I just love that T.I. ad from the 50's... "20 Times Tested" Today you're lucky if they test every 20,000th device!

Mark
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Old 6th February 2006, 02:10 AM   #9
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Quote:
Originally posted by anatech
You just started the next revival. Everyone knows true class "A" is the best sound.
Hehehe. Already did some noodling around with some germaniums. Too damned twitchy for my tastes.

Quote:
Remember the old EV PA amps in the early 70's? Classic class "A", germanium output transistors. Nice coming in from the cold in the winter.
Yeah, and the bias on those things probably went out of wack just from the bit of cold air that blew through the door.

se
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Old 6th February 2006, 02:12 AM   #10
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Default Re: Re: Re: Re: The first pocket transistor radio

Quote:
Originally posted by Tube_Dude
Triodes only for the 3 terminals , because the impedance "looking" in the collector of the transistor is very high ( hundreds of KOhms ) it look more , like a pentode .
I don't care. It has three terminals. It's a !@#$% TRIODE, DAMMIT!

Quote:
In the schematic you provide (without feedback) , we have a transconductance output stage and the speaker is in current drive mode ...
Yeah. Gonna get me one of those little critters and rip out all the other crap and use the output stage to drive a 16 ohm compression driver on a very efficient horn.

se
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