"Thanks for the pointers. I have some new tubes coming though these were all new before I put it in storage. I will check the tweeter situation. I have been so focused on the RF-IF that I bunched the change in volume with the BC-SW switch…"
The Fine Things are Always Hand Made
sloane freeman's Discussions
Could use some tech advice Scott 800B
Started this discussion. Last reply by sloane freeman Mar 17, 2023. 17 Replies 0 Likes
Took my 800B out of mothballs but could not locate speaker so rigged up a jones plug with a pair of resistors for the field, the jumper to turn it on, and and some speaker wire to a bookshelf…Continue
Scott 800-BFM Eye Response
Started Jan 24, 2015 0 Replies 0 Likes
Perhaps this is normal but the shadow on the FM eye seems to be modulated whereas the AM shadow is steady.Is this normal or does it represent a need to match the demodulator's load resistors or…Continue
Thanks to All and Looking for a Philharmonic and amp
Started Jan 23, 2015 0 Replies 0 Likes
Thanks to everyone who kindly provided answers and directions. The 800-B is working beautifully! Special thanks for the creators of the volume and tone control mods!I will look into the possibility…Continue
800-B FM Tuning eye circuit
Started this discussion. Last reply by José Bustos Nov 27, 2016. 21 Replies 0 Likes
A couple of times the FM tuning eye worked perfectly. Now it barely reacts. Brand new Japanese 6E5's. Schematic says the FM eye adjustment pot should be 1 megohm. It measures 500K as does the one…Continue
sloane freeman's Page
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"Not just stations at different signal strength due to distance and transmitter power?
This radio is early FM technology so stability and drifting during first couple minutes is far short of today's tech.
Be sure you understand certain control…"
"Now I have this problem. After a minute or two on FM from a cold start, the volume drops a good bit and the eye is no longer responsive on this station that is very close. I can tune to another station and the eye is responsive. I…"
"I have encountered a couple failed adjustable air caps. The press fit failed due to the pressure of a brass tension spring.
Encountered on a Philharmonic in the broadcast band oscillator adjustment. Couldn't keep adjustment, then slipped and…"
"Thanks! It's a shame all that power has to be generated then wasted in heat."
"Surface area of the heat dissipating element. The field coil has a much larger surface area over which heat may be dissipated hence less heat buildup within the field coil."
"Just did and thanks! I'm wondering why the two 25 watt resistors I am using in place of the field get hot enough to burn your finger but when I have the field coil speaker hooked up the field coil only gets a little warm. Also I am using a…"
"Did you pull all the technical manuals from the Scott Info Archive here? Set Folders >> 800B has all the manuals for the 800B, a well-documented set. See pages 42-43 in Technical Service Manual 2 for the AM alignment instructions. I'll…"
"Thanks a lot for your help Kent! I was losing it I tell ya! You put me right next to the problem, After checking out L2 and C1, I checked out the other trimmers and C15, an air variable had come apart and was shorted. I have…"
"Make sure that the ferrite tuning is still good and in place in coil L2. Also, make sure that trimmer C1 is grounded and in good shape. I chased a problem in the FM circuit on an 800B and finally found a corroded ground on a trimmer. While fixing…"
"It acts as if something was filtering out the signal below about 5mHz, the lower I go in frequency, the more it attenuates the signal."
"I am going nuts! SW works reasonably well. I have a Buzit rf noise generator I put on the antenna input. With the band switch on SW the signal comes through loud the entire band. I change the switch to BC and starting from…"
"Well since can you get stations by bypassing the rf stage I suggest you do checking there. It maybe something as simple as corrosion on the band switch. The oscillator can be checkin the voltage on the grid. If it drops to zero as…"
"Hi,
Thanks for responding. This circuit uses a separate oscillator and mixer. Should I check the oscillator then? I have a digital meter with some sort of O-scope capability though I have not used it before. I will see if I can see…"
"Do you have an oscillioscope? If so check the oscillator output in the converter to see if dropping."
"I have the tubular loop contraption, but since I don't have the FM dipole or the multi wire AM one that are part of the combo, I have the switch set in the counterclockwise position and use a longwire antenna for AM and SW, and a twinlead…"
Comment Wall (1 comment)
- At 6:01am on June 30, 2019,
don baker said…
Hello Mr Sloane: my apologies to you, i had a store to close and move everything to storage. it was quite an undertaking. i will be checking my E.H. Scott messages tomorrow, and maybe we can converse about the Philharmonic that i have for sale if you are still interested. the photo you have of my philly is the same one i am selling. You see, i am 75+ years old, and the move was overwhelming to say the least. I wanted to bring this one back to life, and what i mean by that is, i closed a electronics store recently that was 71 years old, we repaired electronics and also tube mono/stereo equipment, we always brought our electronics up on a variac and never ever plugged them in to see if it lighted up!! so, i have never plugged the philharmonic into a wall socket. i did have one member tell me after i gleefully told everyone of my find, that he thought maybe all i may have to do is change out the capacitors, and he also said, and i bet it will work. well all i had time to do was to test a few of the tubes and all that i had tested on a tv-7 army surplus tube tester after it was calibrated professionally were all excellent. i may have tested about 15. then i had to get back to reality and take care of my customers. so, i am not sure what all i can do for you, but i am available to talk about my baby. oh, by the way, i hate the use of philly to describe this radio, A 1939 Philharmonic deserves a little respect after all of the world events it has reported on. this Philharmonic was 3-3/4 old when i was born in october of 1943. after i reported the serial number to mr. Braithewith he thought it may have been built around December maybe as a Christmas Gift. well thank you for being a friend of E.H. Scott's Products.
Don Baker
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