Philmore 3 transistor radio kit

10/30/2011 5:41:08 PMDan Middleton

I have aquired a three transistor Philmore radio kit taht I am looking for a schematic for. The wires connected to the RF tranformer have some wires disconnected.

10/30/2011 6:03:13 PMWarren

This link does have the Philmore 3 transistor radio kit plans. It's most likely your radio.

http://www.crystalradio.net/transistorplans/index.shtml

10/30/2011 8:03:38 PMEdd

Sir Dan . . . . .

The THE pre-zact schematic I was gonna refer you to.

With their use of fahnestock clips for interconnects to the transistors, you might have mistaken the diode as a third transistor.

At any rate I might suspect that they only used one ferri loop antenna stick and you could compare your units wiring to this info.

With its connection into the base circuitry of the 1st transistor being the same.

With the rods muuuuulllllttttiiii turn winding being associated with the connection to the tuning capacitor, while the smaller . . . . fewer turns . . . winding is connecting into the transistor base circuitry.

73's de Edd

A little ignorance can go a long way.

:This link does have the Philmore 3 transistor radio kit plans. It's most likely your radio.
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:http://www.crystalradio.net/transistorplans/index.shtml
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10/30/2011 9:35:56 PMNorm Leal

Interesting, a transistor reflex circuit. Very early when transistors were expensive.

The 1st transistor is used as a RF amplifier. Then through the diode detector and back through 1st transistor as an audio amplifier.

Norm

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:Sir Dan . . . . .
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:The THE pre-zact schematic I was gonna refer you to.
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:With their use of fahnestock clips for interconnects to the transistors, you might have mistaken the diode as a third transistor.
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:At any rate I might suspect that they only used one ferri loop antenna stick and you could compare your units wiring to this info.
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:With its connection into the base circuitry of the 1st transistor being the same.
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:With the rods muuuuulllllttttiiii turn winding being associated with the connection to the tuning capacitor, while the smaller . . . . fewer turns . . . winding is connecting into the transistor base circuitry.
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:73's de Edd
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:A little ignorance can go a long way.
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::This link does have the Philmore 3 transistor radio kit plans. It's most likely your radio.
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::http://www.crystalradio.net/transistorplans/index.shtml
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10/31/2011 10:29:06 AMDoug Criner

I didn't find a date on the documentation for this kit. But I would guess mid-1950s.

10/31/2011 3:39:47 PMDan Middleton

:I didn't find a date on the documentation for this kit. But I would guess mid-1950s.
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The radio does have three transistors and one detector diode.

10/31/2011 3:40:10 PMDan Middleton

:I didn't find a date on the documentation for this kit. But I would guess mid-1950s.
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The radio does have three transistors and one detector diode.

11/7/2011 2:36:43 PMTo Dan

10/31/2011 3:40:10 PMDan Middleton

:I didn't find a date on the documentation for this kit. But I would guess mid-1950s.
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The radio does have three transistors and one detector diode.

10/31/2011 6:10:31 PMEdd

Sir Dan. . . . .

O.K. then . . . just HOW ? similar is the supplied documentation in accordance to your unit . . .. particularly in respect as to the case, ferri loop antenna, tuning condenser, speaker, parts layout and where does that mysterious third transistor of yours seem to be used your sets circuitry ? . . . . . probably for extra gain in the series AF stages .

If like the unit shown, the first thing in order might be the replacement of that special old RCA VS300 battery in its "D cell " sized casing and its two male / female end battery connection clips.

I have one of the very first RCA pocket portable transistor (SN # 0000009) units, and it also used that same battery, needless to say it is now using our more common rectangular 9V transistor battery.

This was just after the FIRST infamous Regency / T.I. TR-1 came out . . . which was using a using a 22 1/2 V (hearing aid ) battery.

( Just try finding one of those nowadays at your corner drugstore ! )

Also of prime consideration, would be replacement of all of the electrolytic caps used in that unit . . . however . . . surprisedly . . . I find quite a few units that still work after 50+ years of aging.

Certainly that loop antenna is probably, the same . . . .right . . . . as that initially seemed to be your prime area of contention ? and query about same.

Looking at the pics speaker, I was initially wanting to take that 719 as being the EIA identifier of the speaker manufacturer, but that doesnt jibe with my most suspected Quam Nichols code of 270 , Utahs 328, Oaktrons 934, nor is it the common 260 Philco identifier or THE actual 262 of Philmore.

Plus . . . I can't make out the third digit of the numbers on the speaker cone.
Soooooooo that initial 719 numbering . . . with it representing the 19th week of 1957 manufacture certainly "scatterguns" the probability of the dating of this vintage unit, along with my being familiar with the first generation of germanium Raytheon semiconductors being utilized in the unit.

At that timeframe I was just delving into the development and production of SILICON transistors at T.I.

73's de Edd

A short line OUTSIDE of a building becomes a long line INSIDE .

::I didn't find a date on the documentation for this kit. But I would guess mid-1950s.
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:The radio does have three transistors and one detector diode.
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11/2/2011 12:06:42 PMDan Middleton

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:Edd
I drew out the circuit.
An extra class A stage of AF is added.
Also: The rf stage goes to a RF transformer instead of the choke and the diode is connected to the secondary of that transformer.

Dan
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:Sir Dan. . . . .
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:O.K. then . . . just HOW ? similar is the supplied documentation in accordance to your unit . . .. particularly in respect as to the case, ferri loop antenna, tuning condenser, speaker, parts layout and where does that mysterious third transistor of yours seem to be used your sets circuitry ? . . . . . probably for extra gain in the series AF stages .
:
:
:If like the unit shown, the first thing in order might be the replacement of that special old RCA VS300 battery in its "D cell " sized casing and its two male / female end battery connection clips.
:
:
:I have one of the very first RCA pocket portable transistor (SN # 0000009) units, and it also used that same battery, needless to say it is now using our more common rectangular 9V transistor battery.
:
:
:This was just after the FIRST infamous Regency / T.I. TR-1 came out . . . which was using a using a 22 1/2 V (hearing aid ) battery.
:
:
:( Just try finding one of those nowadays at your corner drugstore ! )
:
:
:Also of prime consideration, would be replacement of all of the electrolytic caps used in that unit . . . however . . . surprisedly . . . I find quite a few units that still work after 50+ years of aging.
:
:
: Certainly that loop antenna is probably, the same . . . .right . . . . as that initially seemed to be your prime area of contention ? and query about same.
:
:
:
:
:
:
:
:Looking at the pics speaker, I was initially wanting to take that 719 as being the EIA identifier of the speaker manufacturer, but that doesnt jibe with my most suspected Quam Nichols code of 270 , Utahs 328, Oaktrons 934, nor is it the common 260 Philco identifier or THE actual 262 of Philmore.
:
:
:Plus . . . I can't make out the third digit of the numbers on the speaker cone.
:Soooooooo that initial 719 numbering . . . with it representing the 19th week of 1957 manufacture certainly "scatterguns" the probability of the dating of this vintage unit, along with my being familiar with the first generation of germanium Raytheon semiconductors being utilized in the unit.
:
:
:At that timeframe I was just delving into the development and production of SILICON transistors at T.I.
:
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:73's de Edd
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:A short line OUTSIDE of a building becomes a long line INSIDE .
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:::I didn't find a date on the documentation for this kit. But I would guess mid-1950s.
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::The radio does have three transistors and one detector diode.
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11/6/2011 8:05:52 AMLewis L

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::Edd
:I drew out the circuit.
:An extra class A stage of AF is added.
:Also: The rf stage goes to a RF transformer instead of the choke and the diode is connected to the secondary of that transformer.
:
:Dan
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::Sir Dan. . . . .
::
::
::O.K. then . . . just HOW ? similar is the supplied documentation in accordance to your unit . . .. particularly in respect as to the case, ferri loop antenna, tuning condenser, speaker, parts layout and where does that mysterious third transistor of yours seem to be used your sets circuitry ? . . . . . probably for extra gain in the series AF stages .
::
::
::If like the unit shown, the first thing in order might be the replacement of that special old RCA VS300 battery in its "D cell " sized casing and its two male / female end battery connection clips.
::
::
::I have one of the very first RCA pocket portable transistor (SN # 0000009) units, and it also used that same battery, needless to say it is now using our more common rectangular 9V transistor battery.
::
::
::This was just after the FIRST infamous Regency / T.I. TR-1 came out . . . which was using a using a 22 1/2 V (hearing aid ) battery.
::
::
::( Just try finding one of those nowadays at your corner drugstore ! )
::
::
::Also of prime consideration, would be replacement of all of the electrolytic caps used in that unit . . . however . . . surprisedly . . . I find quite a few units that still work after 50+ years of aging.
::
::
:: Certainly that loop antenna is probably, the same . . . .right . . . . as that initially seemed to be your prime area of contention ? and query about same.
::
::
::
::

::
::
::
::Looking at the pics speaker, I was initially wanting to take that 719 as being the EIA identifier of the speaker manufacturer, but that doesnt jibe with my most suspected Quam Nichols code of 270 , Utahs 328, Oaktrons 934, nor is it the common 260 Philco identifier or THE actual 262 of Philmore.
::
::
::Plus . . . I can't make out the third digit of the numbers on the speaker cone.
::Soooooooo that initial 719 numbering . . . with it representing the 19th week of 1957 manufacture certainly "scatterguns" the probability of the dating of this vintage unit, along with my being familiar with the first generation of germanium Raytheon semiconductors being utilized in the unit.
::
::
::At that timeframe I was just delving into the development and production of SILICON transistors at T.I.
::
::
::73's de Edd
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::
::A short line OUTSIDE of a building becomes a long line INSIDE .
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::
I remember selling those things in the shop I worked after high school about 1958-1959. Reflex, 'cause transistors were rare avises in those days.
Lewis
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::::I didn't find a date on the documentation for this kit. But I would guess mid-1950s.
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:::The radio does have three transistors and one detector diode.
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