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81

Tube Amp Building - Tweaks - Repairs / Re: silvertone 1484

« Last post by passaloutre on June 04, 2026, 09:08:08 pm »

Yes that would drop the screen voltage and all the preamp voltages. You’ll have to experiment with dropping resistors to get it right. My estimate is 15k, but I could be way off.

82

Tube Amp Building - Tweaks - Repairs / Re: silvertone 1484

« Last post by johnfromcyrene on June 04, 2026, 07:52:43 pm »

So if you wanted to lower the voltage you would increase the 1k 5 watt resistor in the mojotone layout?

83

Tube Amp Building - Tweaks - Repairs / Re: Ch. Mixing resistors of 100K, 220K, 270K or 470K?

« Last post by dogburn on June 04, 2026, 07:24:35 pm »

So what is a 5f3? Do you mean 5e3? Either way, it would be interesting to see what you come up with.

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Tube Amp Building - Tweaks - Repairs / Re: Ch. Mixing resistors of 100K, 220K, 270K or 470K?

« Last post by Brownie on June 04, 2026, 05:17:29 pm »

Thanks for that. I guess I'll have to set up my board in order to make it easy to try various pairs of resistors. Then I can hear for myself

85

Other Topics / Re: Meme of the day

« Last post by shooter on June 04, 2026, 04:50:20 pm »

...

86

Tube Amp Building - Tweaks - Repairs / Re: silvertone 1484

« Last post by bmccowan on June 04, 2026, 02:58:59 pm »

You might want to look at this thread https://el34world.com/Forum/index.php?topic=16698.msg165443#msg165443
and contact Tubegeek - he built one and was pretty happy with it.

87

Tube Amp Building - Tweaks - Repairs / Re: Valco National 1201 1202 Sportsman

« Last post by passaloutre on June 04, 2026, 02:53:42 pm »

Oh you don’t want to mess with the Loctals! I’ll be happy to take those amps off your hands

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Tube Amp Building - Tweaks - Repairs / Re: Valco National 1201 1202 Sportsman

« Last post by bmccowan on June 04, 2026, 02:44:32 pm »

Hey, the vacuum is bigger, eh?
I've got a couple old Masco's and Flot-a-tones with those Loctals. Haven't messed with them yet. Ha, I'm 72, its about time eh?

89

Tube Amp Building - Tweaks - Repairs / Re: First amp build

« Last post by Mongrel714 on June 04, 2026, 12:47:29 pm »

Hey Guys, I have been thinking about it and I really want to build the 50watt JCM, I'm getting a new 50 watt OT for my Birthday later this month, I'm building a Marshall correct chassis, (we have a metal break and whole metal shop, wood shop, graphics shop, were I work! I already have the amp head cabinet 70% finished, the electronics package is for the JCM 800, so here we go!!

90

Tube Amp Building - Tweaks - Repairs / Re: Valco National 1201 1202 Sportsman

« Last post by passaloutre on June 04, 2026, 12:24:20 pm »

I'm with you on the 6SL7! Though lately I've been using the "Loctal" 7F7 version, converting a couple old PA/HiFi amps to Tweed Deluxe variants with the full suite of Loctal 7F7-7C5-7Z4. As far as I can tell the 7F7 internals are identical to a 6SL7, but they are available NOS or JPO (just-plain-old) for pennies.

Anyways, maybe its psychological but these octal/loctal preamp triodes do sound sweeter to me