Hi all, I have a Detrola with a missing under chassis if transformer, it is an AC?DC model, just wondering if an if transformer from a battery operated set would work ok, B+ is not quite as much on the batt madel.

:Hi all, I have a Detrola with a missing under chassis if transformer, it is an AC?DC model, just wondering if an if transformer from a battery operated set would work ok, B+ is not quite as much on the batt madel.
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Should work if the primary/secondary impedances are similar, and if the donor transformer has (or can be set to) the same IF frequency as the receptor set. If impedance and/or resonance frequency are greatly dissimilar the set will have very poor (or no) performance. If both sets are tube sets there should be no problem with matching impedances; and chances are good that you can adjust the padder caps to get the circuit to resonate at your set's IF frequency. Worth a try, anyway.

::Hi all, I have a Detrola with a missing under chassis if transformer, it is an AC?DC model, just wondering if an if transformer from a battery operated set would work ok, B+ is not quite as much on the batt madel.
::
:= = = = = = =
:
:Should work if the primary/secondary impedances are similar, and if the donor transformer has (or can be set to) the same IF frequency as the receptor set. If impedance and/or resonance frequency are greatly dissimilar the set will have very poor (or no) performance. If both sets are tube sets there should be no problem with matching impedances; and chances are good that you can adjust the padder caps to get the circuit to resonate at your set's IF frequency. Worth a try, anyway.
:
I have a coule of battery sets I kept for parts I could look up their schematics and match the frequency, I really would like to get the Detrola working.

:::Hi all, I have a Detrola with a missing under chassis if transformer, it is an AC?DC model, just wondering if an if transformer from a battery operated set would work ok, B+ is not quite as much on the batt madel.
:::
::= = = = = = =
::
::Should work if the primary/secondary impedances are similar, and if the donor transformer has (or can be set to) the same IF frequency as the receptor set. If impedance and/or resonance frequency are greatly dissimilar the set will have very poor (or no) performance. If both sets are tube sets there should be no problem with matching impedances; and chances are good that you can adjust the padder caps to get the circuit to resonate at your set's IF frequency. Worth a try, anyway.
::
:I have a coule of battery sets I kept for parts I could look up their schematics and match the frequency, I really would like to get the Detrola working.
:It makes no difference if an IF transformer is from a batt or electric set. What makes the biggest difference is the ----IF freq----. It has to match up with the other trans. Otherwise it will NEVER work. All the if's have to be the same freq. so they can track with the local osc. We had a joke in electronic school: One of the students asked "if theres a local osc. in a set, can there be such a thing as a DISTANT osc."?? Our instructor replied "SURE"!! There were a few laughs until he told us "A piece of test equipment called a SIGNAL GENERATOR! A few of the guys sat there with their mouths WIDE open because they never heard of a SIGNAL GENERATOR. I couldn't keep from laughing because I HAD one already. I bought an EICO kit as soon as school had started. We got paid so much from the FED. & ST. gov. But we had to keep our grades ABOVE a "D" at least!! They didn't know that I had one, I didn't say anything until I had it all put together at home & checked it out on my ZENITH M660 that I talk about. I used WWV at 5, 10, 15 & 20 MCs.

::It makes no difference if an IF transformer is from a batt or electric set. What makes the biggest difference is the ----IF freq----. It has to match up with the other trans. Otherwise it will NEVER work. All the if's have to be the same freq. so they can track with the local osc. We had a joke in electronic school: One of the students asked "if theres a local osc. in a set, can there be such a thing as a DISTANT osc."?? Our instructor replied "SURE"!! There were a few laughs until he told us "A piece of test equipment called a SIGNAL GENERATOR! A few of the guys sat there with their mouths WIDE open because they never heard of a SIGNAL GENERATOR. I couldn't keep from laughing because I HAD one already. I bought an EICO kit as soon as school had started. We got paid so much from the FED. & ST. gov. But we had to keep our grades ABOVE a "D" at least!! They didn't know that I had one, I didn't say anything until I had it all put together at home & checked it out on my ZENITH M660 that I talk about. I used WWV at 5, 10, 15 & 20 MCs.
:
:
= = = = = = =

Radio manufacturers didn't really hit on 455 KHz as an AM IF "standard" until the 1940s. Before that, they were all over the place, but mostly in the 450-475 KHz ballpark (some oddballs were MUCH lower). This span was within the adjustment range of the resonator caps, so you could use a "heathen" IF transformer as a replacement in a typical tube radio and have a reasonable expectation that it could be adjusted to work. Of course, it would have to undergo an IF stage alignment as the first order of business.

:::It makes no difference if an IF transformer is from a batt or electric set. What makes the biggest difference is the ----IF freq----. It has to match up with the other trans. Otherwise it will NEVER work. All the if's have to be the same freq. so they can track with the local osc. We had a joke in electronic school: One of the students asked "if theres a local osc. in a set, can there be such a thing as a DISTANT osc."?? Our instructor replied "SURE"!! There were a few laughs until he told us "A piece of test equipment called a SIGNAL GENERATOR! A few of the guys sat there with their mouths WIDE open because they never heard of a SIGNAL GENERATOR. I couldn't keep from laughing because I HAD one already. I bought an EICO kit as soon as school had started. We got paid so much from the FED. & ST. gov. But we had to keep our grades ABOVE a "D" at least!! They didn't know that I had one, I didn't say anything until I had it all put together at home & checked it out on my ZENITH M660 that I talk about. I used WWV at 5, 10, 15 & 20 MCs.
::
::
:= = = = = = =
:
:Radio manufacturers didn't really hit on 455 KHz as an AM IF "standard" until the 1940s. Before that, they were all over the place, but mostly in the 450-475 KHz ballpark (some oddballs were MUCH lower). This span was within the adjustment range of the resonator caps, so you could use a "heathen" IF transformer as a replacement in a typical tube radio and have a reasonable expectation that it could be adjusted to work. Of course, it would have to undergo an IF stage alignment as the first order of business.

Don't try to use a car radio IF transformer, they used, I think, 262 kHz for an IF for some reason.
Lewis
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:Hi all, I have a Detrola with a missing under chassis if transformer, it is an AC?DC model, just wondering if an if transformer from a battery operated set would work ok, B+ is not quite as much on the batt madel.

Absolutely not! The radio wants an AC/DC transformer. It does not some crappy battery transformer and will immedialtely go up in smoke if you even bring one near it. Never forget, these radios are extremely precise devices and you should never deviate from the original parts by even the slightest amount.
:

::Hi all, I have a Detrola with a missing under chassis if transformer, it is an AC?DC model, just wondering if an if transformer from a battery operated set would work ok, B+ is not quite as much on the batt madel.
:
:Absolutely not! The radio wants an AC/DC transformer. It does not some crappy battery transformer and will immedialtely go up in smoke if you even bring one near it. Never forget, these radios are extremely precise devices and you should never deviate from the original parts by even the slightest amount.
::
:I am trying to understand the difference between a batt trans. & an AC trans. If they use the same IF, have the same res. & have the same size wire visually & the same size mechanically why wouldn't they work? I have taken apart batt. trans. & ACDC trans of both sizes. They look perfectly the same to me. When I match up the minature trans. from the batt sets & the electric sets with the same IF freq. I really can't see the difference. The same goes for the larger trans. batt or elec. If the smller ones & the larger ones have the same freq. for both styles where is the problem? There is a voltage across both styles that is low voltage because one end goes to B+ & the other end goes to the plate. Approx. 10 volts is droped across each style & the current is very low. About the only way a transformer would burn up is if the tube was shorted. Our schooling taught us that. The voltage drop is low & the current is minimal across & thru the coil!!!! I would say try it as long as the freq. IS THE SAME & space permits it to be done! Look at the 3-way portables of the 50's. They were both batt & electric. I fthey didn't work they would have put different size trans. for each function. I do not believe that that batt trans. can't be exchanged with an electric one. Sounds like somone doesn't know ohms law.
:

:::Hi all, I have a Detrola with a missing under chassis if transformer, it is an AC?DC model, just wondering if an if transformer from a battery operated set would work ok, B+ is not quite as much on the batt madel.
::
::Absolutely not! The radio wants an AC/DC transformer. It does not some crappy battery transformer and will immedialtely go up in smoke if you even bring one near it. Never forget, these radios are extremely precise devices and you should never deviate from the original parts by even the slightest amount.
:::
::I am trying to understand the difference between a batt trans. & an AC trans. If they use the same IF, have the same res. & have the same size wire visually & the same size mechanically why wouldn't they work? I have taken apart batt. trans. & ACDC trans of both sizes. They look perfectly the same to me. When I match up the minature trans. from the batt sets & the electric sets with the same IF freq. I really can't see the difference. The same goes for the larger trans. batt or elec. If the smller ones & the larger ones have the same freq. for both styles where is the problem? There is a voltage across both styles that is low voltage because one end goes to B+ & the other end goes to the plate. Approx. 10 volts is droped across each style & the current is very low. About the only way a transformer would burn up is if the tube was shorted. Our schooling taught us that. The voltage drop is low & the current is minimal across & thru the coil!!!! I would say try it as long as the freq. IS THE SAME & space permits it to be done! Look at the 3-way portables of the 50's. They were both batt & electric. I fthey didn't work they would have put different size trans. for each function. I do not believe that that batt trans. can't be exchanged with an electric one. Sounds like somone doesn't know ohms law.
::
:k

Raymond;
I, like you, do not understand that post at all. An IF transformer, connected to a plate, can not possibly know if the B+ is coming from a battery or a rectifier. There are very few ways you can construct an IF transformer to connect a plate to a grid.
Lewis

Dude, you've been punk'd! I'm 99% sure that "Alfred E" (Neuman?) is a troll who has randomly inflicted himself/herself on this site.

:Dude, you've been punk'd! I'm 99% sure that "Alfred E" (Neuman?) is a troll who has randomly inflicted himself/herself on this site.
:Wasn't Alfred E Newman that screwball in mad magazine? What me worry? Reminds me of our government!!!! Washington D. C. (Disfunctional Congress)