The reissue 68 Custom Deluxe Reverb cuts NFB in half by using a double size 1. This tube is only in use in the vibrato channel and for two different purposes. Switch in the middle positions disconnects NFB. The Eric Clapton Tremolux is a 2x6V6 fixed bias amp putting out about 20 watts so this circuit will work with any amp with similar or lower output. Deluxe reverb tremolo not working mom. The NFB Resistor and NFB Tail resistor form a voltage divider to set the NFB signal level. 68uF (micro Farad) 25v, increase the plate load resistor from 100k to 220k 1 watt and reduce the big V1B. AB763 Twin Reverb Schematic.
To do this mod to the 65 Deluxe Reverb Reissue you would connect the top of Resistors R23 & R11 with a jumper wire. The added grid stopper also helps when you hammer the amp with a big boost or gain pedal. The tremolo circuit has three disk capacitors. 02uF Mid cap in this chart: Tone Stack Mid Cap Change. 470Ω 2 watt screen resistors are added to keep the screen voltage slightly lower than plate voltage. Deluxe reverb tremolo not working on windows. Rectifier Input: 348VAC (Schematic lists the power transformer as 320VAC with 117v wall power). Replace V1 or V2 with a 12AY7. Raw Switch On and Off.
This is my recommended mod to add reverb and tremolo to the Normal channel in blackface and silverface amps. The strain on the tubes can lead to failure. After getting these voltages I powered the amp through a bucking transformer to bring down all the voltages. The Deluxe, Deluxe Reverb, Vibrolux and Tremolux amps run with low voltage preamps compared to the other AB763 amps. Wire the right terminal to the now empty right resistor eyelet (or turret). If you don't use it you should consider voicing it as a "lead" channel by changing out only four components. Types of Tremolos in Tube Amps — 's Custom Amps. You must clip or remove the left (Normal Channel) 220k channel mixing resistor at far left above. If the problem now dissapeared you may assume one of those were corrupt. It gives the sound nice shimmering effect.
The 68 Custom Deluxe Reverb comes with a British voiced 12 Celestion G12V-70 and the amp gets great reviews. This can also sound like a terrible and scratchy noise when you play certain notes/frequencies. Tremolo before or after reverb. The AB763 Tone Stacks. All of these caps would be 16uF from the factory. To prevent the switch from popping when you engage tremolo you can place a 1M 1/4 watt resistor connected to ground (back of the pot) on one end and to the switch terminal that the yellow wire connects to. The 68 Custom Deluxe Reverb has a 1.
Alligator clip the new cap's + terminal to the first large cap's + terminal and connect the - to -. The often unused Normal channel is also a great place to mod away with to make that channel interesting and usable. You can temporarily alligator clip a resistor in parallel with the existing power resistor to try a lower value. For example your amp is designed to run an 8 ohm speaker with 4 tubes like the AB763 Blackface Single Showman so it will need a 16 ohm speaker when run with 2 power tubes.
The recitifier tube we keep longer than the power tubes as long as it is noise free and can provide a high enough bias current for the power tubes. Be careful removing the dog house cover because the caps might be charged with 430 volts. By simply adding a large parallel capacitor to a presence control we can turn the presence control into a variable negative feedback control. A larger plate load resistor will give more signal swing and boost gain. This will stop all current flow through the tubes and cut output by 50%. Morgan Jones, Valve Amplifiers, 4th Edition. Some players are very selective in choosing specific brands for the different tube functions. The Vox Cut Control connects the two power tube grids with a 220k audio pot and 4.
This is my recommended layout with 470Ω 2 watt screen resistors always in circuit to provide excess screen current protection. Solid state circuitry can work just as well. The Cool Mod also alters the Normal Channel tone stack with a change from a 250pF to a 330pF Treble cap which boosts the mids and allows the Treble tone control to reach deeper into the mids. Pull the knob up to activate the master volume. Just leave the mixing resistor in place. The reverb is working and sounds really really great but i can't get the vibrato to work. Stop Tremolo Ticking Simple one cap fix. The mid scoop is also flattened out. AB763 tone stack Fender Shimmer is one of the main reasons blackface amps are considered the high water mark of Fender amps. Richard Kuehnel, Vacuum Tube Circuit Design: Guitar Amplifier Power Amps. The stronger tube you have the more you will push the next preamp gain stage of the vibrato channel. Watch closely for power tube red plating when you start the amp up after this mod in case you set the Bias trim pot incorrectly.
Bias shifting trem in fixed bias amps that vary power tube bias have several issues: 1. Decreasing the reverb recovery's gain makes the Reverb Control less touchy, somehow enhances the reverb tone and can decrease reverb noise. Neumann & Irving, Guitar Amplifier Overdrive, A Visual Tour It's fairly technical but it's the only book written specifically about guitar amplifier overdrive. 8k resistor with a pot wired as a variable resistor. This smaller cap will sweeten the overdrive tone by reducing bias drift recovery time of an overdriven second preamp stage. Replacing the GZ34 tube rectifier with a solid state rectifier like the plug-n-play Weber WS1 Copper Cap will supply the amp with a little more voltage and current to better drive the big 6L6 tubes. 0047uF) capacitor to allow variable high end cut. This mod removes the Normal Channel's. Another mod to consider for a Vibroverb conversion is to install a Tremolo Cut Switch which will boost the amp's gain to mimic the 3 preamp gain stage Vibroverb.
If you don't want to lift the board to disconnect the tremolo wire you can disconnect it at the Tremolo Intensity pot and then run a new wire from the intensity pot to the two Mixing resistors. It routes a silverface amp's Normal Channel through the reverb and tremolo effects and through the V4B third preamp gain stage. Tubes can also become microphonic meaning that they whistle and resonate with certain frequencies, sometimes sounding like broken glass. Just replace the volume pot with a 1MA (1 meg audio) push-pull pot and connect the 6. In the Low position input impedance is 62k (1M in parallel with 66k) and grid stopper resistance is 33k. I had one modder get an oscillation when he bypassed his tone stack with a raw switch. Connect the Raw switch to the free end of R9 and the empty R9 mounting pad. If you don't want to try multiple caps I recommend you go with a 32uF. Connect the other switch terminal to ground and you're done.
This amp has both channels run through the reverb circuit and uses bias vary tremolo instead of AB763 signal tremolo. As the 2'nd gain stage in the preamp section this tube is just as important for the tone as the V2 preamp tube. The Tone Stack is a series of three RC (resistance capacitance) audio filters that block three bands of audio frequencies. The output end is connected to R25. This very cool 1/4 Power Switch is from the 20 watt Fender Eric Clapton Tremolux. The V1A 220k 1 watt plate load resistor will add gain to the channel's first preamp gain stage and make overdrive more likely in the amp's following gain stages. The C and D power resistors are located in the "doghouse" which is located outside the chassis next to the output transformer. I then pulled the chassis from the cabinet to take a peek at the circuit.
If the 18k resistor limits your minimum bass setting too much you can try a smaller value resistor like a 12k. We also have to adjust the size of the NFB resistor and the phase inverter tail resistor (PI Tail in layout) to compensate for the presence control's added resistance (going from 47 ohm NFB tail to 4. The only difference from above is the Boost Switch is shown on a 250KA (audio or log) push-pull Treble pot. If this does not produce the desired results, then the leads should be dressed as follows and excessive lengths shortened.
You simply replace the master volume pot with a resistor on a switch. The 65 DRRI & 68 CDR's first two filter caps are 220uF 100v and 47uF 500v connected in series which is equivalent to a 38. The more playing hours the weaker the tubes get. Welcome To the Hoffman Amplifiers ForumMarch 09, 2023, 11:43:49 pm. Phase inverter tube.
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