10-07-2022, 06:59 PM
(This post was last modified: 10-07-2022, 07:13 PM by Mike Watterson.)
Invicta models often have no model number and only the pony badge or logo, if even that!
Glad mystery solved. Likely not as a common as the regular Pye style.
Is it preset or tunable LW? The Pye P123xx had both versions.
My son bought me this as a birthday present one year
https://www.radiomuseum.org/r/invicta_29.html
It took a while to figure out the make and model. I didn't know about the pony or horse then, which is the only ID. The Pye version has same PCB but no built in mains adaptor. The PAM version is the same insides (mains option) but a different style case.
Pye Jewel case version: https://www.radiomuseum.org/r/pye_p114bq.html (no mains)
The Invicta 28 is the same as the Jewel case model but rexine, no chrome panel https://www.radiomuseum.org/r/invicta_28.html The Invicta 29 simply adds mains and unusually uses a parallel shunt selenium rectifier and series resister to have the 1.35V rather than the 6.8V common on 7.5V series battery valve sets. Two series 1N4007 as parallel shunt and changing series resistor will work, but is over run if only 1 or 2 valves fitted. As will 2 x 1N5407. The lower PIV 1N400x and 1N540x don't have as much forward drop at the same current.
Glad mystery solved. Likely not as a common as the regular Pye style.
Is it preset or tunable LW? The Pye P123xx had both versions.
My son bought me this as a birthday present one year
https://www.radiomuseum.org/r/invicta_29.html
It took a while to figure out the make and model. I didn't know about the pony or horse then, which is the only ID. The Pye version has same PCB but no built in mains adaptor. The PAM version is the same insides (mains option) but a different style case.
Pye Jewel case version: https://www.radiomuseum.org/r/pye_p114bq.html (no mains)
The Invicta 28 is the same as the Jewel case model but rexine, no chrome panel https://www.radiomuseum.org/r/invicta_28.html The Invicta 29 simply adds mains and unusually uses a parallel shunt selenium rectifier and series resister to have the 1.35V rather than the 6.8V common on 7.5V series battery valve sets. Two series 1N4007 as parallel shunt and changing series resistor will work, but is over run if only 1 or 2 valves fitted. As will 2 x 1N5407. The lower PIV 1N400x and 1N540x don't have as much forward drop at the same current.
