A 10KA Mid pot is Fender standard but a 25KA, 50KA or 100KA can be used to give the Mid tone control more authority. The blackface tone stack is a passive filter so it cannot boost any frequency band, it can only remove parts of the guitar audio signal. The Normal channel's coupling cap + new 220k Channel Mix resistor easily span the distance to the Vibrato channel's new 220k Channel Mix resistor. Deluxe Reverb Power Resistors. In a bigger perspective we consider the brand of the tube to be less important for your tone than i. the guitar strings, pickups and speakers. Bias shifting trems that work on power tubes are hard on the power tubes and power supply which can lead to failures. Deluxe reverb tremolo not working on mac. The same goes for V9 and V10--they share the brown output transformer wire. DC Voltages with 6L6GC Power Tubes biased to 67%.
Run 6L6 Power Tubes In 6V6 Amps. If you have not been trained to work with high voltage then have an amp technician service your amp. The resistors are mounted next to the Bass tone pots. Wire the pot's left terminal to any ground. Deluxe reverb tremolo not working on youtube. There are two basic types of bias shifting tremolos: one that work on the bias of the power tubes and ones that work on the bias of a pre-amp tube. Less resistance = more signal mix and less output volume. This mod puts a little more strain on the V5 tremolo tube so if the tremolo stops working after changing the two caps just install a fresh 12AX7. You don't need to modify the power resistor. Fender Normal Channel Reverb Mod Apply reverb and tremolo to both channels the way Fender did it in the 68 Custom Deluxe Reverb. Turn it up and I transition from blackface to tweed tone.
To send the Normal Channel signal through the reverb and tremolo you simply connect the V1B and V2B plates at the bottom (input, nearest tubes) of the two coupling caps. The extra current draw of the big tubes can over tax some power transformers. This is the most transparent of all the master volume types. With the push-pull down you will have a normal tone stack. For the Type-3 master volume you simply add a 1 mega ohm audio (log) pot and two wires. Types of Tremolos in Tube Amps — 's Custom Amps. 2k (1 watt or higher) will give you 1k of resistance [ 1 / (1/10k + 1/1. 02 Mid cap and an extra 18k resistor between the Bass pot and Mid resistor. The Deluxe, Deluxe Reverb, Vibrolux and Tremolux amps run with low voltage preamps compared to the other AB763 amps. You can double-click any component in the tone stack schematic to change its value so it's easy to see what happens to the control movements when you change the 100k slope resistor to 56k or adjust the value of the Mid resistor. This will allow you to use modern 3-prong accessories with the amp. Phase inverter tube. Master Volume + Vox Tone Cut Master volume AND late-in-the-circuit tone control. This is my recommended layout with 470Ω 2 watt screen resistors always in circuit to provide excess screen current protection.
Since 2 power tubes put out half the current of 4 tubes we need to double the speaker impedance so 2 tubes feel the same load as when 4 tubes are used. Deluxe reverb tremolo not working group. On the deluxe reverb that I just got, the vibrato is not working. The Presence Cap bleeds NFB high frequencies to ground and also blocks DC from flowing through the Presence pot. I like to do this to just one channel so consider changing the Normal Channel's V1A and/or V1B plate load resistor.
The different NFB circuit compensates for the 4 ohm transformer's lower output voltage. This circuit differs from the Fender 5F6A schematic and layout but matches what was actually installed in most 5F6As from the factory. Some of these amps are the Deluxe Reverb, Vibrolux Reverb, Pro Reverb, Super Reverb, Twin Reverb, Vibroverb, Bandmaster Reverb. 4 = 82k for the new NFB resistor. Since the trem works by affecting the bias of power tube it can affect the stability of the power section. This cap can be seen in all Deluxe Reverbs through the Deluxe Reverb II. Replace the C power resistor with a 1k 3 watt. Rectifier Input: 348VAC (Schematic lists the power transformer as 320VAC with 117v wall power). Most AB763 kits use period correct carbon composition resistors but metal film resistors generate 1/10th the noise of carbon comp. If you really want near-bedroom volume levels then a 90% cut in power can be attained by using a 16 ohm 25W resistor for the upper resistor and a 12 ohm 25W resistor for the lower resistor (8 ohm output transformer secondary). If you keep the wire runs relatively short and away from the power transformer end of the amp you should be OK without using shielded coax. The Vibrato channel tone wires are wrapped and the Doghouse A, B & C power wires are wrapped. Adding Mid resistance adds mid frequencies and reduces the tone stack load which adds gain.
Most cathode biased use pre-amp tube bias shifting trems but there is version that modulates the bias indirectly through the grid leak resistors of the power tubes. You won't get a 50% output volume cut but it will help tame these beasts. 8k Mid Resistor and No Mid Pot. Set the trim pot to maximum resistance before installing so the bias will be set to coolest. The nearest standard resistor value is a 39k NFB resistor for amps with 100 ohm NFB Tail resistors.
The V1A plate load resistor is R4. Playing our amps amost every day, we try to keep a pair of 6V6 or 6L6 power tubes for at least 4-5 years. The 3-Way NFB Switch gives you "Normal", "Light" and "Heavy" NFB options. If your particular speakers are giving you too many 'ice pick' highs simply adding a 100pF Mica capacitor across the feedback resistor will filter out some very high freqs that can cause ice pick highs. It's purpose is to filter out unneeded high frequencies which helps cut noise and prevent oscillation in the sensitive reverb circuit. They are accompanied by a 220k 1 watt bleeder resistor connected across each cap. Merlin Blencowe, Designing High-Fidelity Tube Preamps. JBL D120F Loud, clean, efficient but heavy and adds some mids the amps needs. Fender 5G9 Tremolux. Change the tone stack caps and resistors to suit your taste. If you are anal you can completely eliminate the Type-3 from the amp circuit by adding a switch to disconnect the circuit.
047uF coupling cap and both channels guitar signal flow through the Vibrato Channel's. Like most amplifier negative feedback loops this mod will reduce distortion, tighten the transition from clean to dirt and slightly reduce gain. The main speaker jack on the left is 8 ohm full power. You must also clip or remove the V1B. Quad Power Tube Half Power Switch Kill two of your four power tubes at the flip of a switch. Removing V1 will also raise the plate voltage on all the preamp gain stages which adds a some gain also. It has two 8 ohm speakers wired in parallel to give the transformer its needed 4 ohm load.
I recommend a 3 watt rating for these resistors for longevity's sake. I like to keep mine in all the time. If your amp has a negative feedback loop then tap it from the main speaker jack tip connection. 10% Power Jack Use your Aux jack as a 10% output jack. C and D Power Resistors in the Twin Reverb. Turning the 100KA Mid pot up high gives us a "tweed" type tone due to a flatter tone curve and more gain. 0022uF bypass cap around the 220k V4A Grid Leak resistor. I haven't tried any of the Dumble mods but I include them here for completeness. For example connect a 16 ohm speaker to an 8 ohm speaker jack but most amps will run fine with this amount of impedance mismatch. The cap also sends high frequencies from the NFB loop to ground which boosts highs at the speaker.
This very cool 1/4 Power Switch is from the 20 watt Fender Eric Clapton Tremolux. Rob recommends doing the lead dress changes in 1 & 2 below]. However, if the problem was still present in the normal channel, you need to replace V1, V6, power tubes and rectifier, one by one, until you hear the problem again. You can place your master volume pot anywhere but you may have to use shielded wire to prevent noise or oscillation. Channel Mixing Resistors Bright Cap Mod Get a little more brightness from either channel.
You can use this resistor across the Raw switch to fine tune the level of gain added when the raw switch is turned on (opened). 1/2 Power Switch Pentode / Triode Switch Cut power tube output for lower volume. 8k Mid resistor R9 and the C4 Mid cap. Splice in a SPST ON/OFF mini switch in the Tremolo Intensity pot's yellow (input) wire to completely disconnect the tremolo circuit. Reverb and tremolo are available on both Vintage & Custom channels. All these types of sound different because the device that is oscillated responds differently. They will still sound good and we only replace them in amps where we need maximum power available in the amp and if we can hear the amp is weak by comparing it to another.