04-25-2023, 07:39 AM
Last First:
1920's era parts became obsolete by the early 30's. NOS parts are still "floating" around as well as parts salvaged from sets scrapped...
Placing a want ad in the Phorum and in the ARF classifieds will benefit greatly.
The name brand of the switch and its construction as possibly an image of it requires research on your part..... more in a bit...
My impression is you want to restore the radio, must take a proper triage of all the components, do NOT disturb the wiring at any time until a near matching schematic can be found. You will need to know if the audio transformers are good taking resistance measurements with an analog ohmmeter must be done to access. Do not use a digital meter as most cannot deal with the very high reactance of these transformers upwards of 30 henrys and with Karas likely more.
The more.. Look at the other jacks very likely there will be a brand name, at least take a couple pix to reveal design and construction of the jacks. All jack companies made switches, that brand is most likely been the switch that was cannibalized. An image of the switch could then be found by searching World Radio History (early radio).
Kits of 20's radios often had "levels" of kit supplied, meaning some just IF/osc coils, others more components still others all components including a pre-drilled engraved panel, everything including bus wire and solder.
Going only with the images offered you will need at least two tube sockets too. Mud tube sockets generally do not have a brand markings and can only be found by comparison. dsturz of ARF provides many 20's era parts removed from derelict sets, contact via ARF.
IMHO the sockets are probably 'mud" composition but it is possible to break a quality Bakelite socket too.
As far as the missing capacitor and errant wiring. Many early capacitor designs are hardware mountable and not soldered in. It could have been cannibalized.
I sincerely hope that you will stay with OEM components and not result in crude makeshifts such as "stuffing". For the missing cap look at other caps in the radio, they are most likely Dublier 601 type. What ever the others are they can be found used., Yes, they will leak if they have gotten damp over time and possibly could be restored using a toaster oven at warmer heat.
As for the value of the "missing" cap. it will become evident if it is missing and required for function or may not, in some designs where hook-up directly to a loop is involved. Savvy builders often modified circuits for their purposes, not all mods were successful.
Publish the circuits you now have or point to their sources so I and others can review.. If I cannot provide enough data, post to the ARF superhetrodyne topic and go from there. I have but two super types form the 20's so hard evidence of function of others must come from other collectors. You will also need tubes so likely all '01a's and a 112 in the last audio.. If a power supply is used do not skimp on design function, I recommend an ARBE-III despite the cost as it is very flexible for other 20's radios and rugged, it is repairable when out of warranty.
GL
Chas
1920's era parts became obsolete by the early 30's. NOS parts are still "floating" around as well as parts salvaged from sets scrapped...
Placing a want ad in the Phorum and in the ARF classifieds will benefit greatly.
The name brand of the switch and its construction as possibly an image of it requires research on your part..... more in a bit...
My impression is you want to restore the radio, must take a proper triage of all the components, do NOT disturb the wiring at any time until a near matching schematic can be found. You will need to know if the audio transformers are good taking resistance measurements with an analog ohmmeter must be done to access. Do not use a digital meter as most cannot deal with the very high reactance of these transformers upwards of 30 henrys and with Karas likely more.
The more.. Look at the other jacks very likely there will be a brand name, at least take a couple pix to reveal design and construction of the jacks. All jack companies made switches, that brand is most likely been the switch that was cannibalized. An image of the switch could then be found by searching World Radio History (early radio).
Kits of 20's radios often had "levels" of kit supplied, meaning some just IF/osc coils, others more components still others all components including a pre-drilled engraved panel, everything including bus wire and solder.
Going only with the images offered you will need at least two tube sockets too. Mud tube sockets generally do not have a brand markings and can only be found by comparison. dsturz of ARF provides many 20's era parts removed from derelict sets, contact via ARF.
IMHO the sockets are probably 'mud" composition but it is possible to break a quality Bakelite socket too.
As far as the missing capacitor and errant wiring. Many early capacitor designs are hardware mountable and not soldered in. It could have been cannibalized.
I sincerely hope that you will stay with OEM components and not result in crude makeshifts such as "stuffing". For the missing cap look at other caps in the radio, they are most likely Dublier 601 type. What ever the others are they can be found used., Yes, they will leak if they have gotten damp over time and possibly could be restored using a toaster oven at warmer heat.
As for the value of the "missing" cap. it will become evident if it is missing and required for function or may not, in some designs where hook-up directly to a loop is involved. Savvy builders often modified circuits for their purposes, not all mods were successful.
Publish the circuits you now have or point to their sources so I and others can review.. If I cannot provide enough data, post to the ARF superhetrodyne topic and go from there. I have but two super types form the 20's so hard evidence of function of others must come from other collectors. You will also need tubes so likely all '01a's and a 112 in the last audio.. If a power supply is used do not skimp on design function, I recommend an ARBE-III despite the cost as it is very flexible for other 20's radios and rugged, it is repairable when out of warranty.
GL
Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
