Posts: 1,267
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Joined: Jan 2014
City: Wellborn Florida
1.7-3.9 %, a modified Sine wave inverter is around 25%. Most generators from big box stores run 10% at a 50% load. What is the distance from your HF rig to the power supply? Have a Zantrex (Pro-Watt) power inverter purchased in 2005 rated as one of the best NOT! If you get within 20 feet of the beast with a portable AM radio all you hear is BUZZ. If I run a 50 foot ext cord a tube radio radio on AM is happy. Run my 2 meter rig using a very old Aston power supply with a heavy transformer hope I never drop that thing on my foot . David
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RE: Zenith H725 - by David - 04-10-2025, 04:06 PM
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1949 Motorola 5A9M
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Nice job on the battery, Bob. Can the box be opened to replace the 9 volters?RodB — 11:32 AM |
Philco 46-1209 strange behavior
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Thank you for the detailed response MrFixr.
To clarify, the hum starts when the tubes are fully warmed up, and goes a...sq65 — 09:15 AM |
Philco 46-1209 strange behavior
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MrFixr
The chassis, if there is no ground pin in the AC plug, due to the Y-caps from L/N to the chassis, is at 60VAC re...morzh — 08:47 AM |
schematics
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thanks I'll try the polar caps seperatelymseno — 07:38 AM |
Philco 46-1209 strange behavior
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Hi SQ55,
A strange issue indeed! Just so I have you straight, on a dim bulb you get normal operation after the set warm...MrFixr55 — 12:44 AM |
schematics
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I think mseno is talking about cap# 27 which is a multisection but in a paper tube. In cases like that I've usually be ...klondike98 — 11:25 PM |
schematics
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Ohrenet :roll:
For their price I would chase a fly in a field. :twisted:Vlad95 — 11:21 PM |
1949 Motorola 5A9M
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A bit more work on the Motorola. I got the repro battery together right up until I realized the snap clips on the top o...klondike98 — 10:45 PM |
schematics
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Often restuffed.
If a twistlock, Hayseed Hamfest makes modern replacements.
morzh — 09:18 PM |
schematics
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Looking for a multi-sectional 8+16 mfd cap. Can't find any suppliers that carry it.mseno — 08:45 PM |
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