Posts: 1,296
Threads: 44
Joined: Nov 2017
City: Menlo Park
State, Province, Country: CA
Step 1 alignment went well. Peaked up the 10.7 MHz if and the tracking of the front end. That brought a nice improvement in sensitivity and put stations where they belong on the dial. Also it improved the auto switching to stereo mode. A small portable receiver at the same location shows the signals are not very good in the test location, so I will try running in a better spot.
Next, I am starting to think over the "IBAM" grid bias adjustment and resistor/ cap changes needed on the output stage.
Fun progress!
I don't hold with furniture that talks.
Messages In This Thread
RE: Fisher 500C restoration - by EdHolland - 04-25-2019, 03:57 PM
Users browsing this thread: 9 Guest(s)
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Recent Posts
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B&K 1077B no video
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| Hello Tim,
I would if it's a leaky Capacitor So are all 3 of those B- voltages low then ?
Sincerely Richardradiorich — 01:55 AM |
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B&K 1077B no video
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| I found a schematic and think I have the problem traced down to the minus power supply. I have very low voltages that go...TV MAN — 12:41 AM |
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RCA 15X
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| I'd try replacing the bulb first and if that doesn't do it, then change the 35Z5 and see if the problem goes away.NostalgiaRadioTime — 12:28 AM |
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B&K 1077B no video
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| Hello Tim,
I have that exact unit in my shop too plus a Sencore unit there are times I like one or other !!.
Sincerely...radiorich — 11:07 PM |
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RCA 15X
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| Everthing goes at once, maybe it's the cold weather, I have had 2 dial strings break and no my little RCA is having dial...Paul Philco322 — 10:26 PM |
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Philco 91 Schematic
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| Hi Dan,
I can't explain this specific resistor but I have seen the use of a switch to apply B+ voltage to screen gri...RodB — 09:36 PM |
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6TPZ and 5TPO Radio Help
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| I suspect it's been repaired before.
And I suspect whoever repaired it, wanted to re-use old transistors' pin stubs in o...morzh — 09:24 PM |
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B&K 1077B no video
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| Thanks Rich! I'll take a look and see what he has. I know there's more modern equipment to be had, but this one I know a...TV MAN — 09:11 PM |
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B&K 1077B no video
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| Hello Tim,
Here is a link to restoration of one on Phil's old radios site !
Sincerely Richard
bk1077bradiorich — 09:01 PM |
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6TPZ and 5TPO Radio Help
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| I'm a little befuddled on this one. Should X5 and X4 be tied together like this? It looks like someone added this at so...R3Sons — 07:33 PM |
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