This is a three-tube radio with one of the tubes, according to the schematic on this site http://www.nostalgiaair.org/Resources/244/M0029244.htm
, being an 89RS.
I have found several lists of Rogers-Majestic tubes but never any mention of this tube. Does anyone have any ideas as to what might work?
One other thing is there is a hole in the righthand side that I believe is original and made for a switch of some kind. The schematic doesn't show any switch. I'm stumped on this one, too.
Any help from anyone would be greatly appreciated!
I found 89RS listed as being same as 6G7. 6G7 is a duodiode - pentode similar to 6B7. It was only used in Canadian radios. Only found it here. At least it gives the basing:
http://oldradio.qrz.ru/tubes/russian/short/6g7.shtml
Norm
:I have recently aquired a great model 403 or 404 mantle radio that someone added lots of extra "stuph" to. I'm trying to get it back to original status but I may now know why the "stuph" was added.
:This is a three-tube radio with one of the tubes, according to the schematic on this site http://www.nostalgiaair.org/Resources/244/M0029244.htm
:, being an 89RS.
:I have found several lists of Rogers-Majestic tubes but never any mention of this tube. Does anyone have any ideas as to what might work?
:One other thing is there is a hole in the righthand side that I believe is original and made for a switch of some kind. The schematic doesn't show any switch. I'm stumped on this one, too.
:Any help from anyone would be greatly appreciated!
I wish it were true but don't see how they could be the same. The 89RS is a 7-pin with cap. The 6G7 is an 8-pin with cap.
Also, there are three screens in the 89RS and only one in the 6G7.
I only have a 1949 RCA Tube Reference book with 166 configurations, only 9 are 7-pin, and none are even similar.
Robin
:Hi Robin
:
: I found 89RS listed as being same as 6G7. 6G7 is a duodiode - pentode similar to 6B7. It was only used in Canadian radios. Only found it here. At least it gives the basing:
:
:http://oldradio.qrz.ru/tubes/russian/short/6g7.shtml
:
:Norm
:
::I have recently aquired a great model 403 or 404 mantle radio that someone added lots of extra "stuph" to. I'm trying to get it back to original status but I may now know why the "stuph" was added.
::This is a three-tube radio with one of the tubes, according to the schematic on this site http://www.nostalgiaair.org/Resources/244/M0029244.htm
::, being an 89RS.
::I have found several lists of Rogers-Majestic tubes but never any mention of this tube. Does anyone have any ideas as to what might work?
::One other thing is there is a hole in the righthand side that I believe is original and made for a switch of some kind. The schematic doesn't show any switch. I'm stumped on this one, too.
::Any help from anyone would be greatly appreciated!
Agree with you. 6G7 in the link is a Russian tube. May not be the same as US/Canadian 6G7? 89RS is listed two places as AKA 6G7 in Tube Lore By Ludwell Sibley.
Does 6B7 llok similar?
Norm
:Cheers, Norm!
:
:I wish it were true but don't see how they could be the same. The 89RS is a 7-pin with cap. The 6G7 is an 8-pin with cap.
:
:Also, there are three screens in the 89RS and only one in the 6G7.
:
:I only have a 1949 RCA Tube Reference book with 166 configurations, only 9 are 7-pin, and none are even similar.
:
:Robin
:
::Hi Robin
::
:: I found 89RS listed as being same as 6G7. 6G7 is a duodiode - pentode similar to 6B7. It was only used in Canadian radios. Only found it here. At least it gives the basing:
::
::http://oldradio.qrz.ru/tubes/russian/short/6g7.shtml
::
::Norm
::
:::I have recently aquired a great model 403 or 404 mantle radio that someone added lots of extra "stuph" to. I'm trying to get it back to original status but I may now know why the "stuph" was added.
:::This is a three-tube radio with one of the tubes, according to the schematic on this site http://www.nostalgiaair.org/Resources/244/M0029244.htm
:::, being an 89RS.
:::I have found several lists of Rogers-Majestic tubes but never any mention of this tube. Does anyone have any ideas as to what might work?
:::One other thing is there is a hole in the righthand side that I believe is original and made for a switch of some kind. The schematic doesn't show any switch. I'm stumped on this one, too.
:::Any help from anyone would be greatly appreciated!
Assuming that your set is missing that 89RS tube from its complement…and are there any other tubes also missing ?
That 89RS certainly looks to be one rare bird, what with the pentode section, being the AF power output tube.
AND THEN
there are a full wave rectifiers tube elements also contained within the same envelope. Much like the units father was a 41-42 power tube and its mother was a 84 rectifier tube , etc.
Looking at the two schematics on that page, you can see how the plain 89 got used up at the top and the lower schematic where the HV winding of the power transformer is routed up to the plates within the 89RS tube with the B+ interconnects being made in the tube internally.
What you might do now is inspect your chassis and see if the power transformer routes its wiring into that AF output tube socket.
If so you might then have to use a 89 which I still see available from WWII surplus stocks for about $5 and then use a tube rectifier externally mounted underneath the chassis to make the DC power with until /if you EVER find that elusive 89RS tube.
Otherwise I have never heard of that 89RS version with its internal rectifier nor any pin out data on it…you will be the sole person to know that IF that 89RS is the unit being used.
The conventional 89 tube should have connections of:
Plate… pin 2
Sup grid… 4
Scrn grid… 3
1st grid… Grid cap
Filament 1-6
Check out the wiring to the tube socket and fill us in.
As for the ”hole for a power switch “, track down the AC line as it moves on into the primary of the transformer and see what it inter connects to.
73's de Edd
Ed.
www.nexicom.net/~oidar/rogerssub89rs.pdf
Its very poor and as good as it gets. No need to request a better scan.
Ed.
This makes some sense of the mess the previous owner had made of this set. They had added a metal plate for an 80 tube held in place by the transformer screws. It stuck out of the back like a giant zit or something. There was also a power resistor screwed into the back of the chassis just over the information plate.
Ed,
Is that web page from the RCC?
:A schematic is posted at--
:
:www.nexicom.net/~oidar/rogerssub89rs.pdf
:
:Its very poor and as good as it gets. No need to request a better scan.
:
:Ed.
The tube sub information was published by Rogers. I don't believe RCC published a schematic for that radio.
Ed.
Don’t know HOW ? that image happened to get trashed so badly, since the tube envelopes signify some stage of digital procedure at one time in its development.
I question one aspect of their reference drawing with their labeling of the R7-R8 resistors……e.g….graphics dyslexia ?
Design places a voltage divider pair being connected across the derived negative supply, it being attained by the resistive floating above ground, of the power transformer’s HV secondary center-tap.
With a -85 source at the topside of the pair, the lower resistive element…labeled as R8 on the Red Ryders parts list….should be the LOWER resistive value of the two, in order to acquire the proper 1st grid bias supply level to the 89 output tube.
As initially drawn, their thumbnail schematic has the designators reversed. Thus giving one a pseudo- ULTRA class C biasing of the audio output tube, if it were to be miss-wired in that manner shown.
With some image enhancement, word recognition processing…..along with some touches of color refinement we now come up with …..
73's de Edd
:
The image was downloaded a year ago from a site that is no longer on the internet. It was cropped to remove uneeded data and posted as is.
Ed.
I wanted to let you know I stumbled on a substitute listing for the 89RS at Frank's Electron Tube Pages at: http://www.mif.pg.gda.pl/homepages/frank/vs.html. It mentions this book: Pjotr Mikolajczyk, Universal Vade-Mecum Electronic Tubes and Semiconductor Elements, Edition 1960.
It says the 6B8-G is the equivilant although a different socket (8-pin instead of the 7-pin and cap) and some rewiring would have to be done. It has all the charts and graphs for the 6B8-G but nothing to compare with the 89RS so I'm not sure if it would work.
I may go the way of Ed's entry of moving the coil anyway but I'd like to keep the three tube look. Probably can't be done.
Ed, what is the name of the book you found the Rogers tube information in?
Robin
:Ed, what is the name of the book you found the Rogers tube information in?
:
The data I posted was not from a book but from a site www.oldradioz.com and that site has been gone for some time. That is why I commented on the fact that I could do nothing about the scan.
You can do a search for Rogers tube substitutions but that usually only returns lists of subs, none covering the 89RS.
Ed.
::Ed, what is the name of the book you found the Rogers tube information in?
::
:The data I posted was not from a book but from a site www.oldradioz.com and that site has been gone for some time. That is why I commented on the fact that I could do nothing about the scan.
:
:You can do a search for Rogers tube substitutions but that usually only returns lists of subs, none covering the 89RS.
:
:Ed.
If you want to keep the three tube look, why not do the mod so beautifully cleaned up by Edd, and use solid state for the rectifier? Two 1N400X, a resistor, and you are up and running until, maybe, someday, you can find one of those oddball rectifier/output tubes, and have no permanant mods so you can maybe go back to the original config.
Lewis
Lewis
73's de Edd
:This is a three-tube radio with one of the tubes, according to the schematic on this site http://www.nostalgiaair.org/Resources/244/M0029244.htm
:, being an 89RS.
:I have found several lists of Rogers-Majestic tubes but never any mention of this tube. Does anyone have any ideas as to what might work?
:One other thing is there is a hole in the righthand side that I believe is original and made for a switch of some kind. The schematic doesn't show any switch. I'm stumped on this one, too.
:Any help from anyone would be greatly appreciated!
:This is a three-tube radio with one of the tubes, according to the schematic on this site http://www.nostalgiaair.org/Resources/244/M0029244.htm
:, being an 89RS.
:I have found several lists of Rogers-Majestic tubes but never any mention of this tube. Does anyone have any ideas as to what might work?
:One other thing is there is a hole in the righthand side that I believe is original and made for a switch of some kind. The schematic doesn't show any switch. I'm stumped on this one, too.
:Any help from anyone would be greatly appreciated!
I found one! A Rogers 89RS with the spray-on shield!
It's from Grandpa's Radio Shop in Kitchener, Ontario, Canada. The Rogers historian gave me the name and phone number of George Fund. HE HAD TWO OF THEM!
Thank you again, Mr. Fund, and to all who contributed to my post!
PS. Bob in Ontario, Canada - try again. Your post didn't come through.