Tech Talk - Victoria "Victoriette" (2007)

20 Watts of Power
Tubes: 1-5AR4, 2-6L6 or 2-EL84, 3-12AX7, 1-12AT7
Reverb and Tremolo
Speaker: 1-Jensen P12Q speaker or 2- Jensen P10R speakers
Cabinet size (HxWxD) - Two cabinet configurations: 2x10 18.5 x 22 x 10.5 and 1x12: 18.5 x 22 x 10.5

Tech Talk - Fender Princeton Reverb (1965)

Circuit:
AA1164

Config:
Combo

Control Panel:
Black, forward facing w/ white labels

Front Conrol Layout:
In, In, Vol, Treb, Bass, Reverb, Speed, Intensity - Pilot Lamp

Rear Conrol Layout:
AC Outlet, Ground Sw, Fuse (1A), Power Sw, Speaker Jack, Ex. Speaker Jack, Vibrato Jack, Reverb Jack, Reverb Out, Reverb In

Knobs:
Black skirted w/ chrome center, numbered 1 - 10

Cabinet:
20" x 16¼" x 9½" (48.9 x 41.3 x 24.1 cm)

Cab Covering:
Black Tolex

Cab Hardware:
Black strap handle, 4½" chassis straps, glides

Grille:
Silver sparkle grille cloth

Logo:
None

Weight:
28 lbs. (12.7 Kg)

Speakers/Load:
1 x 10"/8 ohms

Speaker Model:
Jensen C10R, Jensen C10N, Oxford 10L5 or Oxford 10J4

Effects:
Reverb, Tremolo

Output:
12-15 Watts

Preamp:
7025, ½ 12AX7

Power:
2 x 6V6GT

Bias:
Fixed, nonadjustable

Rectifier:
5U4GB

Phase Inverter:
½ 12AX7 (split load)

Other:
Reverb Driver: 12AT7
Reverb Recovery: ½ 12AX7
Tremolo: ½ 12AX7 (bias vary)

Tech Talk - Fender Princeton-Amp (1964)

Model:
Princeton

Circuit:
AA964

Config:
Combo

Control Panel:
Black forward facing w/ white labels

Front Conrol Layout:

AA964: In, In, Vol, Treb, Bass, Speed, Intensity - Pilot Lamp

Rear Conrol Layout:

AA964: AC Outlet, Ground Sw, Fuse (1A), Power Sw, Speaker Jack, Ex. Speaker Jack, Vibrato Jack

Knobs:
Black skirted w/ chrome center, numbered 1 - 10

Cabinet:
16" x 16" x 8½" (40.6 x 40.6 x 21.6)

Cab Covering:
Black Tolex

Cab Hardware:
Black Strap handle, 4½" chassis straps, glides

Grille:
Grey (63) or silver sparkle grille cloth

Logo:
None (64-65)



Speakers/Load:
1 x 10"/8 ohms

Speaker Model:
Jensen C10R or Oxford 10J4

Effects:
Tremolo

Output:
12 Watts

Preamp:
7025

Power:
2 x 6V6GT (push pull)

Bias:
Fixed Bias, nonadjustable

Rectifier:

AA964: GZ34

Phase Inverter:
½ 12AX7 (split load)

Other:
Tremolo: ½ 12AX7 (bias vary)

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Tech Talk - Gibson GA-90 (1956)

A "Revelation in Rythm" - the GA-90 was introduced alongside Gibson's first electric bass - the violin-shaped EB-1. Finished in dark brown "buffalo-grained" leatherette.

The amplifier features six 8 inch speakers, strangely enough it may seem. The confined throw of a speaker from that period combined with a small cone area makes it less appropriate for deep bass reproduction. Just adding more speakers won't do the job. This amp was designed by Seth Lover to rid the problem of the large single coil pick-up for the new bass guitar

that "would make a god-awful hum" when it got to close to the amplifier. Later he would try solving this problem by designing the "humbucking" pickup. Top mounted preamp with control panel and a bottom mounted chassis for the main amp. 25 watts output.
Speakers 6-8"
Inputs
(instr. + mic.) 2+2*
*hi-gain sw. 2
Channels 2
Volume Controls 2

Bass, treble
for ea. ch. No
Tubes 8
Preamp. 2-6SJ7 2-5879,
Phase splitter 6 6SL7
Output (5881)
Rect. 5V4 5Y3
Watts Output 25

Tech Talk - Danelectro Pioneer Model 15 (1954)

made in Red Bank, NJ 115 volts ac 60 cycle 50 watt input
vibrato speed strength and footswitch jack
instrument 3 inputs treble vol and bass
microphone 2 inputs tone and vol
tubes 6s5 2- 6sj7 pair of rca blackplate 6v6's
12 inch speaker codes rl-1114-14 and 274437

Tech Talk - Fender Bandmaster (1959)

Model/Circuit Number: 5E7
Years of Production: 1955 – 1960
Era: Narrow Panel
Configuration: Combo
Controls: Chrome top facing w/ white screened labels, controls numbered 1-12
Knobs: Black Chicken Head
Faceplate

* Front: Ground Sw, Fuse (3A), Power Sw, Standby Sw, Pilot Lamp, Vol, Mic Vol, Treb, Bass, Presense, In, In, Mic In
* Rear:

Cabinet

* Dimensions: 21½” x 22½” x 10¼”
* Hardware:
* Handle: Brown Raised Leather Handle
* Feet: Nail in Feet
* Corners: None


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Tech Talk - Fender Super Reverb Blackface vs. Silverface

The Fender Super Reverb was a guitar amplifier made by Fender. It was introduced in 1963 and was discontinued in 1982. This was essentially a Fender Super amplifier with built-in reverb and vibrato. The original Super Reverb amplifiers were all tube design and featured spring reverb. There were two different designs, distinguishable by the color of the "face" or front control panel. Super Reverbs from 1963 through 1967 had "black face" panels.

From 1968 until its discontinuation in 1982, the Super Reverb had "silverface" cosmetics and circuitry. Early models in 1968, while cosmetically "Silverface", did contain "Blackface" circuitry.

* 40 watts into 4x 10" 8-Ohm Jensen speakers (wired in parallel for 2 Ohms)

* Silverface models: 45 watts (power increased to 70 watts in 1975 and was given a Master volume with pull-out boost circuit and a solid state rectifier. Changed to 135 watts RMS in 1978 with an additional Mid control pot for the Normal channel and a Line Out jack socket.) Silverface amps made between '68 and '72 were emblazoned with "Super Reverb-Amp". After 1972 this was changed to just "Super Reverb".

Tube (valve) complement:

* 4 X 12AX7,
* 2 X 12AT7,
* 2 X 6L6,
* 1 X 5AR4/GZ34 RectifierTube for blackface amps and 5U4GB for silver face amps

* two channels: Normal and Vibrato, with Bright Switch

* Height: 24⅞" (63.2 cm)
* Width: 25⅛" (63.8 cm)
* Depth: 10½" (26.7 cm)

* Weight: approx. 65 lbs.

* A "Boost" control and a master volume were added in 1975.

* A Mid control for the Normal channel and a Line Out jack socket were added in 1978.

* Super Reverbs produced between late 1980 and 1981 have blackface cosmetics and a silver sparkle grille cloth.

* Master volume has a pull-out pot for distortion.

Tech Talk - Steelphon Junior (mid 60's)

Little known Italian made amp 5-10 Watts 2x8" speaker

Tech Talk - Dynacord MV15 (1960)

Valves / Tubes 6: ECC83 ECC83 EF86 EZ81 EL84 EL84
Principle Audio-Amplification
Wave bands - without
Power type and voltage Alternating Current supply (AC) / 110,125,160,220 Volt
Loudspeaker - This model requires external speaker(s).
Power out 15 W
from Radiomuseum.org Model: MV15
Material Metal case
Shape Table model, with any shape - general.
Dimensions (WHD) 225 x 150 x 125 mm / 8.9 x 5.9 x 4.9 inch

Tech Talk - Fender Super Reverb Head (1967)

Model:
Super Reverb

Circuit:
AB763

Control Panel:
Black, forward facing w/ white labels

Front Conrol Layout:
Normal: In, In, Bright Sw, Vol, Treb, Bass - Vibrato: In, In, Bright Sw, Vol, Treb, Mid, Bass, Reverb, Speed, Intensity - Pilot Lamp

Rear Conrol Layout:
AC Outlet, Ground Sw, Fuse (2A), Power Sw, Standby Sw, Speaker, Ex. Speaker, Vibrato Jack, Reverb Jack, Reverb Out, Reverb In

Knobs:
Black skirted w/ chrome center, numbered 1 - 10

Cab Covering:
Black Tolex


Grille:
Silver sparkle grille cloth

Logo:
Grille mounted, raised, chrome & black script "Fender" w/ tail


Effects:
Reverb, Tremolo

Output:
40 Watts

Preamp:
Normal: 7025
Vibrato: 7025, ½ 7025

Power:
2 x 6L6GC

Bias:
Fixed w/ bias adjustment pot.

Rectifier:
GZ34

Phase Inverter:
12AT7 (long tailed)

Other:
Reverb Driver: 12AT7
Reverb Recovery: ½ 7025
Tremolo: 12AX7 (photoresistor)


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Tech Talk - Masco MA 50 (1942)

40-50 Watts(its loud) setting is 2ohm for 4x10" speakers
speaker: Epiphone 2x10" cabinets
tubes: 2x5U4,4x6L6, 2x7C7, 1x7N7, 1x7F7
Masco Amplifiers were largely a mail order brand available through Layfayette, Archer and other large electronics supply catalogs. It could also be purchased at music stores and appliance stores as an inexpensive house brand.

Masco PA heads are widely available and good quality. They were disgned for voice or music amplification. They differ from Guitar amplifiers in that they did not have the high gain preamp stages and produced more realistic tones. This makes them excellent harp amps.

Many harp players use masco heads with custom speaker cabinets or make a combination amp cabinet. They amps often have multiple speaker outputs to accomodate a variety of speaker combinations. The microphone input is perfect for a high impedance mic such as the JT-30.

MASCO stands for Mark Alan Sampson Company and the amps were produced on Long Island, NY during the 1940s and 1950s. The circuits in Masco amps were often incuded in SAMS photofacts and appear regularly on eBay.

Tech Talk - Dynacord Jazz (1963)

This tube combo-type amplifier was made by Dynacord in late 50s era, called JAZZ (simple but greatest naming!!). Tube's composition are 2 x ECC83, 1 x EZ81, 2 x EL84. 20w simple amplifier but sounds warm and great. Not BOOMY on the mid-range, very clear tone. But S/N is not good. inputs are : 1 x Microphone, 1 x Puckup, 1 x radio. each has the volume pot and 1 x tone-control pot effects overall sounds. Dynacord-JAZZ has the several version. One is the simplest 1 x 10inch speaker (8 ohm). This is the 2 x 10inch speakers (15ohm each). Speaker units was made by Dynacord with Alnico-Magnets. The Amp-head model was also available. This is the red-light gray colored model, but the simple black model also released.

Tech Talk - Fender Bassman vs. Fender Bassman RI

First tube is preamp, 12AY7 is specified. 6072A may also be used. A low-noise, low-microphony 5751, 12AX7, or 7025 is also usable, though they will have more voltage gain and will change the sound of the amp considerably.

Second tube is a 12AX7. This is the driver. Any 12AX7 or 7025 is usable here--it need not be low-noise or low-hum, nor does it need to be tested for microphony.

Third tube is a 12AX7. This is the phase inverter tube. This tube need not be low-noise or low-hum, nor does it need to be tested for microphony. It must have good quality heater insulation. 12AX7s or 7025s are suitable. Good NOS 12AT7s may also be used here. We understand that some technicians recommend Ei or JJ ECC83s for this duty.

Power tubes are a pair of 6L6 (5881s were originally specified). Recommend using matched pair of 6L6GCs or NOS 6L6Gs, GAs, GBs, or WGB, or 5881s. Current TAD 6L6WGC-STR and re-issue Tung-Sol 5881 are the best option in place of NOS tubes. Also acceptable are NOS JAN-Philips 6L6WGB, and NOS types 7581A, KT66 or 350B. NOS metal 6L6s run too hot. DO NOT use other types.

Rectifier tube is type 83. This is a rare mercury-vapor rectifier. Only costly NOS is available. The similar type 83-V might work, although some technicians recommend against it. Warning: if an 83 rectifier is broken, there is a risk of mercury poisoning. tube 4 inputs Presence, Middle, Bass, Treble, Vol. Bright, Vol. Normal controls ground, power and standby switches

FModel/Circuit Number: 217-1000-010
Years of Production: 1990 – Present
Era: Vintage Reissue
Configuration: Combo
Controls: Chrome top facing w/ white screened labels, controls numbered 1-12
Knobs: Black Chicken Head
Faceplate

Front: Ground Sw, Fuse (3A), Power Sw, Standby Sw, Pilot Lamp, Presense, Mid, Bass, Treb, Vol Bright, Vol Normal, Bright Hi-Gain In, Bright Lo-Gain In, Normal Hi-Gain In, Normal Lo-Gain In

Speaker

* Size: 4x 10
* Impedance: 2 ohms
* Model: Jensen P10R(For more info, check out the Jensen Replacement Speakers)

Effects:
~Watts: 45 watts
Tubes

* Pre amp: 3 x 12AX7
* Power: 2 x 6L6GC

Bias: Fixed
Rectifier: Solid State plug-in (can be replaced with a 5AR4)
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Tech Talk - Lectrolab R200 (1953)

* 2 Inputs, one Volume, one Tone control.
* The filaments in these tubes are powered by 25 to 50 volts AC. This is in contrast to almost all modern amps which use 6.3 volts.
* 50L6 is the power amp tube, capable of 4 to 8 watts depending on the circuit. Without knowing the transformer specs, or measuring an example, we can’t state with certainty what the R200 output is.
* 35Z5 is the rectifier. These have been used in other designs with no power transformer, which can lead to the chassis being “hot” (117VAC) whether the amp is on or off. I believe the term “widow-maker” refers to that design feature. The R200 and R200b schematics both show a power transformer that would isolate the line voltage from everything but the tube filaments. One side of the AC line is tied to ground through a capacitor, creating a “signal ground”.
* This does not make them safe! The schematic does not show how the chassis is grounded.

Tech Talk - Harley Benton GA5 (2008)

Harley Benton GA5 guitar combo - 5W Class A, 8" speaker, 1 channel, 1 volume & 1 tone control, thomann 1x 12AX7 & 1x EL84 tubes, 4 Ohm external speaker output. Weight: 10.5kg, size WDH mm 364 x 215 x 390 (incl. handle, 20 broad x 210 long and feet, 18 high)

Tech Talk - Premier Twin 12 (1965)

30 watts of power. 2 6V6 Power tubes.12inch Jensen speakers. Tremelo

Tech Talk - Dynacord KV-10 (1952)

The pretty small tube combo amplifier with 8-10w power. Inputs : 1 x Microphone, 1 x pickup, 1 x radio. Also the red and blue colored models were released. Manufactured in the late 50s era. Both of the front and back have their Covers for protection when its touring. 1 x 10inch speakers built in. 110v - 240v usable.

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Tech Talk - National Stage Star (1954)

National "Stage Star" (1954)
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15-20 Watts 4 x oval Rola speaker
Tubes- 5U4, 2x6L6, 6SQ7 and 6SC7

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Tech Talk - Echolette C30 (1976)

Echolette C30 (1976)
30 Watts 1 x 12" speaker
solid state (no tubes!!!)
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Tech Talk - Premier Twin 8 R (1965)

Tube configuration is a 6X4 rectifier, two 12AX7 pre-amps, (one for 1st gain stage, the other to drive the tremelo circuit), and a 7591A power tube (single ended, class A.) A pair of 8" alnico speakers, this baby absolutely barks killer harp tone. Surprising amount of bass from those two little 8's, rich, creamy overdrive, great sounding harp amp. Twin 8's "rule" for harp, except you gotta mike it for loud gigs. I'm convinced a rig made up of a dozen Premier Twin 8's cabled up in parallel would be the ultimate harp rig! "

If you support live Blues acts, up and coming Blues talents and want to learn more about Blues news and Fathers of the Blues, Like ---Bman’s Blues Report--- Facebook Page! I’m looking for great talent and trying to grow the audience for your favorites band! -  ”LIKE”