Affects value, to some of them. We have measured the -3dB point at 12Hz for full power. 05uF cap in parallel with the 170k resistor (near center of schematic) are the RFI AC ground cap (death cap) and V1 Current Return Resistor. All the tube filaments are still connected in series, so removing the 35W4 would have created a new problem--how to drop the voltage on the series string of filaments (the remaining two tubes) by an additional 35V. 758 Kay mandolin w/ OC E <$450 Clean, minimal wear, slight mar on headstock at logo, neck has been reset, pitch pipe/strings/how to book and guarantee/care pamphlet incl. Hey there, I just got an old Danelectro Cadet, which is supposedly the same as the amp-in-case transformerless amp, but in a cabinet. Location: Baltimore, MD. I'm building a copy of a Silvertone 1448 case guitar amp (I will be using an isolation transformer, don't worry everyone) but I'm having trouble with the output transformer. My Gregory doesn't, but it's safe to compare it to other three-tube amps. Isolation transformer for silvertone amp in case.com. Any projects that actually did all this would be helpful.
- Isolation transformer for silvertone amp in case.com
- Isolation transformer for silvertone amp in case of rain
- Isolation transformer for silvertone amp in case of cancer
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Isolation Transformer For Silvertone Amp In Case.Com
It sounds great, but ever the tweaker, I'm wondering if there are any tube alternatives I can try for more gain, chime etc... Not trying to take money away from Hammond either though. 2 circuit been tweaked to guarantee superior bass performance from Permalloy core output transformers? Quote from: quadropuss on July 01, 2011, 11:57:35 PM those old 3 tube silvertone amps mic'd are rock machines! And in good shape fetch around 600 700 for both pieces. And we'll incorporate the changes on a small "module, " so as to change the original as little as possible. Body Material: Masonite. If the amp safety ground and chassis are connected to mains ground then you lose all DC isolation. From our listening comments, we then improve on every prototype until we're satisfied. He loved it... Danelectro Cadet 123 1964 Amplifier-needs work | Reverb. unfortunately his girlfriend at the time took it and sold it. A larger isolation transformer might nullify the problem, but when using the N68X the best solution is to rectify twice -- once with a solid-state bridge rectifier to shift the negative voltage over to positive; then rectify again with the 35W4 tube.
I have a Silvertone 1448 case amp I plan to add an isolation transformer and fuse into. Unless otherwise noted, I'm rating them by what I see in the pictures and read in the description. Salvaged from an old Sears Silvertone amp-in-case, re-capped and upgraded. RCA Corporation, RCA Receiving Tube Manual, RC30. I tapped the jack to see if there was input. Connect it directly to the chassis. 1448 Dano tube ampincase only G $149 Cover worn with some tears, NS speaker, insert missing from knob, functional. If the amp is plugged in "backwards" the amp will still function but the chassis will have 125 volts AC mains voltage on it but it will be limited to 4. To be clear the above image with text is from the Robinette site, now here are pics of my amp. Recounts SilverTone: "For those of you familiar with SETs, the Western Electric 91B was the amplifier responsible for the resurgence of the genre. Your mileage may vary--each amp is a little different. Joined: Wed Feb 18, 2009 6:03 pm. Isolation Transformer Upgrade for Old Guitar Amps : 11 Steps (with Pictures. Ironically the schematic has a big "UL" Underwriter Laboratory safety stamp. Each prototype is placed into the circuit and listened to.
Technical director Gilwin Tan explained how they have operated the Model 3. "We have also done comparisons with similarly priced 300B amplifiers from famous firms and collected favorable feedback. " Tried to address this issue.
Isolation Transformer For Silvertone Amp In Case Of Rain
The old AC-to-DC formula is in DC voltage is approx 1. Soooo Many Speakers... the Solid State 1466 was one of the priciest, most powerful amps that Sears ever made available. Unless its been thrashed it should just need a re-cap and resistor check. Estimated DC voltage for the filaments: 120 * 1. A list of known problem amps and. Isolation transformer for silvertone amp in case of rain. As discussed in the "half-wave" step, there are several way to do so. That said, here's an early 50s Silvertone accordion, model 1565, apparently manufactured by the long-running accordion concern Scandalli of Italy... While known as Permalloy in Japan, it is standardized as Fe-Ni Alloy.
It works just fine, and obviously the 100 uF cap is a bit quieter. Experimental use of gravity. So there's more current potential for the amp circuitry than before. They can be evaluated on the fly. Silvertone 1448 Amp in case. With a 45% nickel content, Permalloy "has the largest saturation induction and is used for sensitive relays and AC transformers. " Step 4: Parts and Tools... Tools. Found a silver tone case+amp combo from the 60's (tube! ) He claims he did not try it again. Time for good ol' Ohm's Law (R = E / I, or resistance = voltage / current). Another thoughtful feature are the 4/8-ohm switchable taps.
Joined: Mar Wed 16, 2011 3:17 pm. I used "wire nuts" to connect the wires, but soldering is more secure. The N-68X, being a small transformer, isn't designed to handle this. Went for $1450 on an eBay auction... doggone, it wasn't cheap in the first place! I love the old Danelectro stuff. This may result in a spark... Isolation transformer for silvertone amp in case of cancer. Obviously, your flesh can act as a jumper also (that is NOT a challenge. This Model 1448 in Black with silver sparkle comes with its original, built in amplifier that is fully functional! 670 Kay FHAC w/ OC MOD $365 Clean, top nicely refinished, crack on top repaired, logo laminate in great shape, pickguard insignia strong, light wear. DO NOT come back and haunt me if you die.... A shorted cap can take a irreplaceable audio transformer or power transformer out if it shorts. Really GASing for it. If you want to play with these things, you should know what you are doing! It doesn't pay when the amp is a smoking ruin because of a bad/shorted cap. If not present) and white to the transformer.
Isolation Transformer For Silvertone Amp In Case Of Cancer
Leaving the 35W4 will keep the peak DC voltages at a lower level than the more efficient SS bridge by itself. However, Option C introduces a complication: With even a moderate filter cap, the filament voltage is much closer to DC than the original AC. That means attaching the module somewhere inside the cabinet. The stock Rv value is 160 ohms (for 120V). Switching (auto grounding) 1/4" input jacks have been installed. So clear up what is bad about this. Location: Santa Barbara, CA. Just don't get shocked. Also, if I'm not mistaken, am I going to need a 12.
Nothing technically wrong here, just unusual... (as are two rectifiers, but we know that works. ) This high inductance is necessary to properly load the 300B down to the lowest octave. 1419 Sears tube amp VG $181 Clean, light wear, some water spotting to back cover and inside cabinet. NOTE about this section: There's cost for converting to higher voltage DC filaments--increased power consumption. Specifications: - Finish Details: Black with Silver Sparkle, Original, Good Condition, general playwear with some sparkle worn off, some edge wear along perimeter. However it will function and probably sound different than the original - perhaps not a bad thing. It's a little odd, as the additional filter cap is placed between the two rectifiers. My only other question here is with the tube heaters. Mainly want it for the fact that it is a tube amp that I don't even need to carry...
0SE; Music First Audio Passive Magnetic; Hyperion Sound BEC-P25T.
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