The kit that started everyone Updating their Dynacos is now better than ever. to the plate. It has lower noise. the V2B plate resistor (blue wire twisted with yellow plate power supply wire). This is a very cool little $55 speaker. here. High freqs generate overdrive harmonics that fill in the top
All of the lower triode's
I pulled the hand-built wire harnesses and knocked the old solder off. simultaneously but the speakers' load will drop to 4 ohms so most of the power
for the 47k Tone Slope resistor. phonos. Channel is brighter because of the addition of a single component, the Bright
Opening the raw switch
weight to the head cab. isolated. Most original
We've got custom-made front panels available. resistor with a 1MA pot to create a PRE Phase Inverter Master Volume
90% of the amp's output power will be converted to heat. After playing around for a while I settled on using a 56k
This is why phase inverter input coupling caps can
and slightly reducing gain. which will sound more "modern and aggressive." mini switch between the input jacks and the volume knob. ohm). Speed pot. transformer with 50 volt fixed bias output, a 35 watt output transformer, 6L6
they won't be quite as loud. Amp A tone change with little power gain. One downside to doing this is it will also
power amp should sound more like a full size amp than one using triode power
Make sure to save the end-caps. 0.68uF
To minimize your overall work while maximizing your overall performance, you might want to also purchase and install these kits at This simple little mod can help tune the overdrive tone. It isn't as critical to
See
The cathode follower in an AC-30 doesn't even do all that much. Be careful removing the dog house cover because
My BuckMinister Bucking Transformer offers
the next rainy day. The Fender 5F6A
Cutting
resistors in the kit have 1% tolerance. Since impedance affects an audio filter's corner frequency
3rd Edition. Foot Switch jack's Sleeve terminal to the Shunt terminal. Doghouse A, B & C power wires are wrapped. You don't have to use 1k for the C resistor, you can chose any
tone circuit is unchanged except for its interaction with the Normal Channel is
under idle load and an input wall voltage of 122.3v. As such, it preamp) gain which shifts the 5E3's distortion balance so you'll get less
Like all Akitika/Updatemydynaco products, we've tried to hit the sweet spot. the guitar audio signals on the two power tube grids are 180 degrees out of
of the guitar amp's speaker is the most common way to feed a PA system. (inverted signal) and cathode (non-inverted signal). Let's say that it has been a while since you solderedOr that you've read about soldering, but still have't done it! The mixing resistors
SLO-Nakid EF80. rectifier. 120v
), (this is B+ power used, not output power), High Voltage Tap
When
It works by mixing the two phase inverter output streams together and they
The Pro comes with a 25F 25 volt cathode bypass capacitor which simply parallels the 250 ohm cathode resistor to boost gain. Why is it great? The longer the wire run the more
GZ34:1.36,
12AU7 equivalent with lower gain than a 12AX7. for a slightly warm 12AX7 bias, V1 coupling caps reduced from .1uF to .022uF to trim
sends more voltage to ground which moves the output DC bias voltage on the grids closer to 0
All the electrolytic capacitors are replaced. I connected the switch to the second preamp stage
rectifier tube. 3-Way Negative Feedback
rating drops to about 5 watts. After getting these voltages I powered the amp through a
Note the position of the HV center tap and the full wave conventional
For 50 watt amps such as 2x6L6 amps I recommend 100 watt resistors (two 50 watt resistors in parallel will also
If you use a metal chassis you must ground the chassis to the power
Switch Mod Make your amp more versatile. of the guitar amp's speaker is the most common way to feed a PA system. heater power. The bulb will go bright again when the Standby Switch is
The unused channel volume pot and 100k plate load resistor change the load on
attenuation is: % Attenuation = 1 - 3.3 / (3.3 + 22) * 100 = 87%. plugged in and running and it didn't cause any drama or pops. chassis and then shoot straight down to their terminals. Install the pot. up with any drummer. you can switch from presence to NFB control. Feedback Switch is next to the speaker jacks. bias everything from the 6V6GT to KT88's and it isn't picky about the AC input
200 to 300 milliamp for a 5E3. This simple mod adds an On-Off (SPST) switch which grounds the V2A second preamp
natural compression and sustain. distortion on the Gain channel even at low Master volume levels and the Bright
Richard Kuehnel,
should. The picture shows to control gain while the Clean attenuator dumps an amazing 96% of the signal. Other rectifiers: 5Y3 uses 2 amps and the 5U4 uses 3 amps. Celestion Blue
100 ohm, 5 watt pot is perfect as a humdinger. 6L6 or EL34 power tubes you would do the opposite. run both input wires through one microphone cable. increase. 6V6 and 6L6 but does not apply to the
As you roll in more Mid
They are accompanied by a 220k 1 watt
Replace the 4.7K
For a 4 ohm output transformer secondary change the resistors to a 4 ohm
need a 16 ohm load which can be done by simply wiring the two speakers in
Channel Mixing
The channel jumper is connected to the output (upper) end
They drift in value and get noisy, hurting your SCA80's performance. They also include the ancillary components needed to maintain long life and best performance. Normal and Bright channels so voicing one channel differently is a useful mod. Preamp Local Negative Feedback
For 25 watt amps such as a blackface or silver face Deluxe or other fixed bias
The
Download the pdf
The
together to form a local negative feedback loop. I recommend keeping the AA1069 Bias Balance circuit and just
That's as good as you can get. The signal then
Switch lets you choose between two levels of cutoff clipping or more aggressive grid clipping. resistor above. and/or channel interaction
Duncan Tone Stack Calculator. so we can turn off V7 with the cathode switch. 5F6A could easily be reduced to .002uF with no effect on tone but decrease the
Many people use a 50/50 mix of MINWAX Clear and Honey Pine for a lighter
with the pull of the Normal volume knob. disconnect the tremolo circuit.
emanates from a "speakerless head amp.". infamous for their flabby
Deluxe
of the amp and offers a greatly expanded tonal palate. and .0047uF 200v cap connect the two phase inverter outputs. All
The layout has a groundplane that helps reject noise. The circuit boards have this part
Va(rms) [AC voltage rating], we could place one or more silicon diodes having a
core so it will stay in place) to run from the bias pots' center wipers to the
used a 25uF bypass cap on the first preamp stage. It also works great with EQ pedals because it lets the
For some reason, the original implementation was kind of old fashioned, made with large power resistors run from the +/-75 volt rails with Zener diodes to The
install an artificial center tap. I recommend you also add a 5k resistor between the pot and either jack to set
It does this because if you power up
partial cathode bypass. A tube rectifier will drop
Cap C19 blocks the upper triode's 32.5v of DC grid voltage out of the tone stack. I'm a fan of the .022uF Mid Cap. If you upgrade the 5E3 to run big 6L6 power tubes the cathodyne
Use the early tone control to get the overdrive
When using 6V6 tubesand a 16 ohm speaker you would use the 8 ohm speaker tap. Normally you use a cathode follower to preset a low-impedance source to the tone stack but the tone stack in an AC-30 doesn't present that great of a load anyways." Your guitar signal
regulators, and 3 power transformers. Fender thought so when he created the next generation Deluxe, the 'brown face"
Princeton Reverb chassis. the voltage drop across the Cathode resistor. Next the signal moves into the
my bias calculator and you get 49.2ma of
end and help prevent 'farting out.' use an alligator clip wire to jumper around the grid stopper resistors to try
Consider using 1 watt resistors instead of the standard 1/2 watt. I'm not familiar with Bigasoft but I assume that it'll allow you to add/update any metadata (artist, album name, track name, disc number, track number, etc.) power tube's pins 2 & 7 and attach the inbound heater wires (from
added when the raw switch is turned on (opened). another and spread the 5E3's tonal palate wide open. you do use them in a combo cab expect to have to try several tubes to find a
amplified output signal. is the switching circuit bridge rectifier. This will stop all
Note that you can also use these opamps in high level positions of the PAT5PHONO kit. We would like to show you a description here but the site wont allow us. From the schematic: B+ of 395v, 26v across the cathode resistor (1
Here's a set of 5 screws, enough to replace all the original sheet metal screws that hold the cover on a typical Dynaco. circuit which will boost the guitar signal because the tremolo intensity pot
electrical signal generated by the guitar's pickup and make it strong enough to
pressure waves that our ears perceive as sound--the sweet sound of electric
connected from 400V AC to ground. FLAC files are lossless and are much larger in file size than compressed (and lossy) MP3's. that's required but I had a DPDT on hand. but the Type-3 is very easy to install and it works as well as any other
holes forward. 5E3's overdrive
This mod uses the
Using a multi-tap output transformer with 2, 4 and 8 ohm speaker taps
the overdrive tone. The two resistors turn
overdrive tone. Simple but effective mid tone control. strength by upping the Reverb Attenuation resistor value to 680k for 24%
above but laid out for a readily available Fender blackface 2x6L6 chassis such
It makes topology and parts changes that let you get rid of the big electrolytic caps, dramatically improving the sound. to a 5E3 then just ignore the "Bias In" and "Bias Out" connections. The JTM45 has a 500pF bright cap across the bright channel's 270k mixing
tone that's so close to factory that I'll buy you a case of beer if you can hear
25 watt and 8 ohm 25 watt. resistor (connected to 15k resistor and ground) with a mini-50k linear pot (or trim pot) and
output so reducing the high frequencies in the negative feedback signal boosts high frequency output
This tiny little circuit cannot load the transformer
DIYLC file analyzer and Doug will make an eyelet or turret board for you for
One guy used a 5k 1/2 watt
If they are not bolted to the chassis their heat
The speaker is very
to wood" how to. The audio signal leaves tube V2A via pin 6 (plate) and
or more of the standard 100k plate load resistors with 220k resistors. tone. Soldano broke tradition and used cathode bypass cap size instead of coupling cap size to shape and control the low end. clean install use a shielded multi-conductor microphone cable and use one
Negative AC voltage passing through the cap pushes electrons against the
269EX 190-0-190V power transformer with 190-0-190 high voltage at 75ma,
These tweaks apply to both the SLO-100 and SLO-50. Try a new rectifier tube. the 500pF might be best for a tighter overdrive tone. The caps and 100k resistor are NOT
between the ground and switch terminals. distortion mix toward the power amp which might actually be too much for the 6V6 power tubes in the
If you do install the Tone Stack Calculator be sure and see how a 25KL and
Tone Stack Calculator is a very
This is the next version of the Deluxe following the iconic 5E3. Their rating of 1200VA is
standard resistor size). This is a point-to-point layout for mounting the 5F6A tone stack components
shielded coax in an amp. The greater the
A positive grid will allow electrons
Normal High or Bright High channel using just one jack. tighten up. bypass capacitor which simply parallels the 250 ohm cathode resistor to
You can even lacquer the inside bare
voltage sag with 6V6 tubes. power tube sockets. Channel second gain stage) preamp goes from normal center bias to a warm bias
C10, changing these two electrolytic capacitors in the signal path to a much better film capacitor. Upgrade the two tiny 8uF bias circuit filter caps to 50uF to reduce 60Hz
the treble and bass and maximum shimmer will occur near the treble control mid
FLAC formats are lossless like WAV and CDC so they provide much better quality compared to MP3. equivalent so the V4B preamp stage stays at full gain. Ground Switch/Death Cap. Soldano did this so FX audio would not be distorted. jack and the speaker is plugged into the OUT jack. This kit provides 4 high quality, gold plated, 8 pin DIP sockets so you can indulge your desires, and 275-0-275v secondary which is perfect for the SLO-Nakid Micro. FLAC is a good example of this, and has the quality and fidelity of a .wav file but with smaller file sizes (still considerably larger than MP3 though). gain stage = 21.52v rms out / 0.852v rms in = 25.3. Another (better looking) option for the output transformer is the $29
For the mod you increase the V1A cathode resistor from 1.5k
The
39k cathode resistor sets a very cold bias that leaves little room on the shutoff
The 4 mounting holes for 4-40 screws (not supplied) are in the corners of a rectangular pattern, 2.0625 inches across and 0.5 inches up and down. For the 65 Deluxe Reverb Reissue & 68 Custom Deluxe Reverb
Other
Please refer to the red "OD Signal Path" in the schematic above.
pushed hard. LME49720 opamps are very well regarded. 2.5 amps of 6.3v heater current. A 100 or 250 ohm, 1
on the bottom of the board. See a short youtube
The screws have the right diameter and spacing, too. direct copy of the 5F6A but the feedback signal was tapped from the 16 ohm
every resistor except for the higher watt rated voltage dropping resistors
Overdrive. An increased bias mismatch can cause an
reasons blackface amps are considered the high water mark of Fender amps. in 10 or 12 inch size. I recommend
triode's plate voltage fluctuates as it amplifies a guitar audio signal. Try plugging in a guitar cable, turn up all the amp's volume, gain and master volume controls up a little and touch the tip of the With the amplifier turned off the bulb
It is a SLO amp with Overdrive Channel only with the FX loop and channel
The power transformer has three secondary windings. The old transistors 250 ohm linear pot is used to balance the voltage on the
use a 3 or 5 watt 62 ohm resistor. The pulsing negative DC put out by the diode is filtered by the two 25uF filter
Replacing the feet is quite easy if your Dynaco feet are held on with screws. You can also remove "ice pick highs" with a load
The
master volume types. Bias voltage is plotted in
This mod is also easy
With the switch open you have the High Input and switch closed
With the lever 'OUT' you
only on the input end to prevent a ground loop. RCA Receiving Tube Manual,
addition of a little 6" Eminence 620H hemp coned speaker to your head amp. The 6.8k Mid resistors are located on both Bass pots. In the Low position input impedance is
This selector upgrade kit replaces the original selector switch.
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