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Philco 89L-troubles - Printable Version

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RE: Philco 89L - Radioroslyn - 09-09-2018

>Will this work??
One way to find out. Don't think it will be an issue.

RE: Philco 89L - vecher - 09-09-2018

Ok.. Guess if it doesn't work correctly I can then try to find something that will..

Thanks Terry..

Skip..

RE: Philco 89L - Radioroslyn - 09-09-2018

There's only a couple of things it might effect if in is too high. One would be the avc voltage/timing but since it's Am we are receiving it's going to be pretty negotiable. Would raise the gain of the 1st audio state. Again not a big deal. And may not track well ( all the control at one end of the turning radius). Other than that your home free!

RE: Philco 89L - vecher - 09-09-2018

Ok all wired up now.. Power on tomorrow.. Wish me luck..

Skip

RE: Philco 89L - morzh - 09-10-2018

I'm pretty sure the vol ctl will work. Your AVC will shift. Might be nothing. If it affects things in a noticeable way, the vol ctl could be bypassed with a resistor so the paralleled result would be the same as initial value.

RE: Philco 89L-Problems - vecher - 10-17-2018

Ok Philco 89 Problems... Here we go again..

Completed wiring. Brought up slowly on Variac.. at 115 Volts about 400 Ma.. .. All Tubes light up..

But NO SOUND.. Not even a Hum.. Checked B+ voltage 366 Volts.. On pin 2 of output tube ( Plate) 337 Volts..

I did have the OSC and Det coils rewound.. Tubes check good.. The Field coil and output Transformer check good.

Help... What next to try?

Skip

RE: Philco 89L-troubles - KCMike - 10-17-2018

Skip, could be as simple as a miss wire some where. I would go ahead and retrace the circuit wiring first.

RE: Philco 89L-troubles - Radioroslyn - 10-17-2018

So whatdoyougot on pin 5 of the 42? Should be at ground (0v) and pin 4? Should be abt -20vdc. Oh and pin 3 abt the same as pin 2. Is heater in the 42 working?

RE: Philco 89L-troubles - Steve Davis - 10-17-2018

Skip, if you touch the center terminal of the volume control with your finger, do you hear a loud hum in the speaker?

Steve

RE: Philco 89L-troubles - vecher - 10-17-2018

Will check all..
Thanks
Skip

RE: Philco 89L-troubles - vecher - 10-17-2018

Ok , Here are the results.. If CTR of volume control touched  NO sound ..


So I tried this.. I took out all the tubes and put them back in.. Now radio works.. Still almost NO noise but when I attached antenna the stations came in.. Needs alignment..  as not many stations at low end of band.. The volume control is flaky.. When you start to turn it up its gets loader until about 1/2 way then any farther the volume goes down and distorts.. See previous posts about control..

My guess is that I had a tube in wrong place..or maybe wasn't making good contact..

So now on the alignment and to see what I can do with the Volume control.. Anyone have alignment instructions?

Skip

RE: Philco 89L-troubles - Radioroslyn - 10-17-2018

Should be in rider's but check the code # to get the proper info.

> The volume control is flaky.. When you start to turn it up its gets louder until about 1/2 way then any farther the volume goes down and distorts.
Check your -voltage on pin 4 of the 42. If it's 0 you've got the ct of the power transformer grounded thru the -side of the filter cap.
Try another 75 tube.

RE: Philco 89L-troubles - vecher - 10-18-2018

Terry, OK I will check..

Skip

RE: Philco 89L-troubles - vecher - 10-18-2018

OK Pin 4 of 42 tube Reading -13.5 volts to ground..

Do not have another 75 or 42 tube I think.. But will look..

Skip

RE: Philco 89L-troubles - vecher - 10-18-2018

Have a 75 tube But no 42 Tube..

Skip