Tech Talk - Epiphone Valve Junior (2007)

11 Ply Birch Plywood Construction
5 Watts RMS
Volume Control
Power Switch
1 Input, 1 Channel
1 x 12AX7A Preamp Valve/Tube
1 x EL84 Power Valve/Tube
Single-Ended Class A Cathode Bias Design
Solid State Diode Rectified
Weight: 20.9lbs / 9.5kg
Dimensions: 14.6" x 8.7" x 15.1" / 370mm x 220mm x 384mm
Made in China
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Tech Talk - KAY "K503A"(1962)

KAY "K503A"(1962)
2-3Watt 1x8"speaker
with 'radio' tubes--12AU6, 50L6, 35Z5.

Tech Talk - Suprem "Piccolo"(1963)

Manufacturer/Brand: Suprem; Leinfelden

Valves / Tubes 5: ECC83 ECC83 EL84 EL84 EZ81
Principle Audio-Amplification
Wave bands - without
Power type and voltage Alternating Current supply (AC) / 110; 220 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
Power out 16 W
from Radiomuseum.org Model: Piccolo
Material Leather / canvas / plastic - over other material
Shape Console with any shape - in general (details not known).
Dimensions (WHD) 360 x 220 x 210 mm / 14.2 x 8.7 x 8.3 inch


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Tech Talk - Gibson GA-20 (1956)

Gibson GA20 (1955)
Speaker Config: Jensen P12R
Wattage: 12w
Tube Setup: 5Y3, 2x6V6, 12AY7s

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Tech Talk - Masco MA-17 (1946)

Masco Amplifiers were largely a mail order brand available through LaMasco 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.

These are almost always amps with two 6V6 tubes and older preamp tubes.
1x10" LANEY model "Disco Cabinet" (closed back)
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Tech Talk - Dynacord Jazz (1964)

This tube combo-type amplifier was made by Dynacord , 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. inputs are : 1 x Microphone, 1 x Pickup, 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.

In the 50-60s era, German audio-equipment company used the 3pin DIN plug or 2pin socket for their electrical connections.
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Tech Talk - Seydel Hyper-Amp (2007)

Technical data - Hyperamp HA 1510 REV

Output: 15VA an 4 / 8 Ohm (switchable) *

Speaker: 10'' Jensen P10R 8 Ohm -SPECIAL DESIGN-

Power amplifier: Class A (2 x EL84)

Level indicator: EM84 (magic eye), at the front

Input1: Guitar socket 6,3 mm (mono), -10 dBu at 1 MOhm

Input2: XLR-socket, -30 dBu at 200 Ohm

Effects: parallel, with Level-(Reverb-) control **

DI-output: XLR with transformer (magnetically shielded)

Sound control: 3 bands

Controls at the front: INPUT 1, INPUT 2, BASS, MIDDLE, TREBLE, VOLUME, EFFECT/REVERB, Stand By-switch, line-switch, operation light

Controls at the back: Electric supply with fuse and spare fuse, sockets EFF RET and EFF SEND, XLR-socket DI OUT, socket for ext. speaker EXTERN, socket for int. speaker INTERN, Impedance switch 4 / 8 Ohm

Tube assembly: 1 x EZ81, 2 x EL84, 1 x ECC81, 2 x ECC83, 1 x EM84

Spring reverb: Accutronics, 3 springs
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Tech Talk - Fender Concert-Amp (1963)

Year:
1959-1963

Model:
Concert

Model No:
5G12 (59)
6G12 (60)
6G12-A (60-63)

Config:
Combo

Control Panel:
Brown forward facing w/ white screened labels, controls numbered 1-10

Front Conrol Layout:
Normal: In, In, Bass, Treb, Vol - Vibrato: In, In, Bass, Treb, Vol, Speed, Intensity - Presense - Pilot Lamp (6G12-A)

Rear Conrol Layout:
6G12: Ground Sw, Fuse (3A), Power Sw, Standby Sw, Speaker Jack, Vibrato Jack
6G12-A: Ground Sw, Fuse (3A), Power Sw, Standby Sw, Speaker Jack, Ex Speaker Jack, Vibrato Jack

Knobs:
Brown round

Cabinet:
24" x 24" x 10½" (61 x 61 x 26.7 cm)

Cab Covering:
Pinkish Brown Tolex(59-61) or Brown Tolex (62-63)

Cab Hardware:
Brown plastic or black strap (63) handle, 5½" chassis straps, glides

Grille:
Brown (60-61), Maroon (61-62) or Wheat (62-63) grille cloth

Logo:
Grille mounted, flat, chrome & black script "Fender"

Weight:
55 lbs. (24.9 Kg)

Speakers/Load:
4 x 10"/2 ohms (8 ohms each in parallel)

Speaker Model:
Jensen P10R, Jensen P10Q, Jensen C10R or Oxford 10K5

Effects:
Tremolo

Output:
40 Watts

Preamp:
Normal: 7025
Bright: 7025

Power:
6G12: 2 x 6L6GC
6G12-A: 2 x 5881

Bias:
Fixed Bias, nonadjustable

Rectifier:
Solid State

Phase Inverter:
7025 (long tailed)

Other:
Tremolo: 2 x 7025 (6G12) or 2 x 7025 and ½ 12AX7 (6G12-A) (harmonic vibrato)

Comments:


Model 6G12 had the controls ordered Bass, Treble, Volume, etc.
½ 12AX7 was unused on model 6G12-A
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Tech Talk - Peavey Vintage (1972)

Peavey Vintage(1972)
80-100 Watts 4x10" speaker
four 6L6 power tubes
if you need volume this is it

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Tech Talk - Fender Super-Amp (1962)

Model:
Super

Model No:
6G4-A

Config:
Combo

Control Panel:
Brown forward facing w/ white screened labels, controls numbered 1-10

Front Conrol Layout:
6G4: Normal: In, In, Bass, Treb, Vol - Bright: In, In, Bass, Treb, Vol, Speed, Intensity - Presense - Pilot Lamp
6G4-A: Normal: In, In, Vol, Treb, Bass - Bright: In, In, Vol, Treb, Bass, Speed, Intensity - Presense - Pilot Lamp

Rear Conrol Layout:
6G4: Ground Sw, Fuse (3A), Power Sw, Standby Sw, Speaker Jack, Vibrato Jack
6G4-A: Ground Sw, Fuse (3A), Power Sw, Standby Sw, Speaker Jack, Ex. Speaker Jack, Vibrato Jack

Knobs:
Brown round

Cabinet:
18" x 24" x 10½" (45.7 x 61 x 26.7 cm)

Cab Covering:
Pinkish Brown Tolex(60-61) or rough brown Tolex (62-63)

Cab Hardware:
Brown strap handle, 5½" chassis straps, glides

Grille:
Brown (60), Maroon (60-62) or Wheat (62-63) grille cloth

Logo:
Grille mounted, flat, chrome & black script "Fender"

Weight:
47 lbs (21.3 Kg)

Speakers/Load:
2 x 10"/4 ohms (8 ohms each in parallel)

Speaker Model:
Jensen P10R, Jensen P10Q or Oxford 10K5

Effects:
Tremolo

Output:
40 Watts

Preamp:
Normal: 7025
Bright: 7025

Power:
6G4: 2 x 6L6GC
6G4-A: 2 x 5881

Bias:
Fixed Bias, nonadjustable

Rectifier:
GZ34

Phase Inverter:
7025 (long tailed)

Other:
Tremolo: 2 x 7025 (6G4) or 12AX7, ½ 12AX7, and 7025 (6G4-A) (harmonic vibrato)

Comments:
The 6G5-A tremolo circuit left ½ 12AX7 unused.

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Tech Talk - Premier 71 (1957)

The Model 71 has a big power transformer and two 6L6 power tubes. It has a string of 12AT7 or 12AX7 tubes driving the preamp stages. It also uses a 12AT7 or 12AU7 for the tremelo. It has a 12 inch Jensen Special Speaker and two 3 inch little Jensen Specials acting as tweeters. It was made in the late 1950's and had as much power as the Fender Bassman. It is loved by harp players as well as guitar players.

Tech Talk - Fender Sidekick 10

Latest installment in cool little amps. Check it out!

Dependable amplification for beginners and students! The very affordable Sidekick puts 10 Watts through a 6" speaker, with a pair of tone controls, a headphone jack, and an Overdrive switch for rockin' solos.

Fender amps are one of the guitarists favorite amps. This little Fender Squire Sidekick guitar amp is sure to become a favorite of the young beginner. The Fender Sidekick practice amp is dependable amplification for beginners and students.

This very affordable Fender amp puts 10 watts through a 65" speaker, with a pair of tone controls, a headphone jack, and an overdrive switch for rocking solos. Hook up and wail away.

Fender Sidekick Specifications:

* 10 Watt Amplifier
* 2 Tone Controls
* Headphones Out
* 6" Speaker
* Overdrive switch


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Tech Talk - Silvertone "1432" (1960)

The 1432 was the midline amp in this space-age series, coming on the heels of Sputnik and ushering out the ducktail '50s. The cool, angular design contained essentially the same guts as previous amps in the same power/feature range and gave budding musicians everywhere a solid mid-price, mid-power sound box to power their 'Telstar' and surf rock twangfests. As rockabilly faded and rock began its first round of 'maturing,' so did the look of the amps that powered the sound.
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Tech Talk - Gibson GA-6 (1954)

GA-6 (tweed)

10-14W 2x12" Guitar Combo (identical to the GA-14 Titan except for the 12" speaker)
Speakers: 2x12"
Inputs (instr. + mic.): 2+2 (tweed)
Channels: 2
Volume Controls: 2
Tone Controls: 1
Tremolo: No
Tubes: 5 (2x12AX7, 2x6V6, 5Y3 or (newer version) Pre (2x7025), Pow (1x6V6 PAIR + 5Y3))
Watts Output: 10-14
Shipping Totals: See GA-6 (two-tone)
Harmony Central Review GA-6
Schematic with 2x12AX7, 2x6V6, 1x5Y3

For info on and pics of the Gibson GA-6 Interim Model see Miles O'Neal's web-site.

This amp replaced the BR-6. The circuit is identical to that of the GA-14. (www.drtube.com, March 28, 2003)

Push-pull 6V6s; like a Fender 5D3/5E3 Tweed Deluxe; cross between the two Fender circuits

Tech Talk - Dynacord KV-6 (1954)

Another cool little amp.

Manufacturer/Brand: Dynacord (Pinternagel)
Year: 1955–1960 Type: Audio Amplifier
Valves / Tubes 3: ECC83 EL84 AZ41
Principle Audio-Amplification
Wave bands - without
Power type and voltage Alternating Current supply (AC) / 110; 220 Volt
Loudspeaker Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)
Power out 6 W
from Radiomuseum.org Model: KV6
Material Leather / canvas / plastic - over other material
Shape Tablemodel, Mantel/Midget/Compact but not a Portable (See power data. Sometimes with handle but for mains only).
Dimensions (WHD) 230 x 120 x 160 mm / 9.1 x 4.7 x 6.3 inch

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Tech Talk - Fender "Princeton" 6G2-A (1962)

Our latest installment in small amplifiers.



Year:

1961-1963



Model:

Princeton



Model No:

6G2



Config:

Combo



Control Panel:

Brown forward facing w/ white screened labels, controls numbered 1-10



Front Conrol Layout:

In, In, Vol, Tone, Speed, Intensity - Pilot Lamp



Rear Conrol Layout:

Ground Sw, Fuse (2A), Power Sw, Speaker Jack, Ex. Speaker Jack, Tremolo Jack



Knobs:

Brown round



Cabinet:

16½" x 19" x 9" (41.9 x 48.3 x 22.9 cm)



Cab Covering:

Brown Tolex



Cab Hardware:

Leather handle, 4½" chassis straps, glides



Grille:

Wheat grille cloth



Logo:

None



Weight:

?



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



Bias:

Fixed Bias, nonadjustable



Rectifier:

5Y3GT



Phase Inverter:

½ 12AX7 (split load)



Other:

Tremolo: ½ 12AX7 (bias vary)




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Tech Talk - Fender "Harvard" (1960)

Another great small Fender Amp.
Year:
1955-1962

Model:
Harvard

Model No:
5F10, 6G10

Config:
Combo

Control Panel:
Chrome top facing w/ white screened labels, controls numbered 1-12

Conrol Layout:
Fuse (¾A), Power Sw, Pilot Lamp, Tone, Vol, In, In, In

Knobs:
Black pointer

Cabinet:
Narrow panel, 16½" x 18" x 8¾" (41.9 x 45.7 x 22.2 cm)


Cab Covering:
Diagonal tweed

Cab Hardware:
Leather Handle, glides

Grille:
Brown grille cloth

Logo:
Cabinet mounted, Script "Fender Harvard" on rectangular tag

Weight:
?

Speakers/Load:
1 x 10"/? ohms or 1 x 8"/? ohms

Speaker Model:
Jensen P10R

Effects:
None

Output:
10 Watts

Preamp:
6AV6 or 6AT6 and ½ 12AX7

Power:
5F10: 2 x 6V6GT
6G10: 6V6

Bias:
5F10: Fixed bias, nonadjustable
6G10: Cathode bias

Rectifier:
5Y3GT

Phase Inverter:
5F10 only: ½ 12AX7 (split load)

Comments:


A selenium rectifier was used in the bias circuit of the 5F10.
The Harvard was discontinued in 1962.




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Tech Talk - Fender "Princeton-Reverb" (1974)

Model/Circuit Number: AB1270
Years of Production: 1968 - 1981
Era: Silverface
Configuration: Combo
Controls: Silver, forward facing w/ blue labels
Knobs: Black skirted w/ chrome center, numbered 1 - 10
Faceplate

* Front: In, In, Vol, Treb, Bass, Rev, Speed, Intensity - Pilot Lamp
* Rear: AC Outlet, Ground Sw, Fuse (1A), Power Sw, Speaker Jack, Ex. Speaker Jack, Vibrato Jack

Cabinet

* Dimensions: 20'' x 16''x 9½''
* Hardware: Medium Chassis Straps 4 5/8''
* Handle: Black Strap Handle
* Feet: Glides
* Corners: None


Covering Material

* Tolex/Tweed: Black Tolex
* Grill Cloth: = 70 - 75: Blue Sparkle Grill Cloth =

Logo: Grill mounted, raised, chrome & black script
Weight: 31 lbs.
Speaker

* Size: 1 x 10
* Impedance: 8 ohms
* Model: Oxford 10J4 or CTS 10(For more info, check out the Jensen Replacement Speakers)

Effects: Reverb, Tremolo
~Watts: 12-15 watts
Tubes

* Pre amp: 7025
* Power: 2 x 6V6GT

Bias: Fixed, Nonadjustable
Rectifier: 5U4GB


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Tech Talk - Dynacord DA-15 (1952)

More (but just a little bit) powerful, large and luxury amplifer, called DV15v. 15w power. Also the red colord version was released. Having the 3 input (1 x microphone, 2 x pickup) and there's the TREMORO (vibration) pots (depth and speed controled separately). 110v - 240v usable.

Tech Talk - Gibson GA-30 (1948)

Here's our daily amp video. These old Gibson amps can really have an interesting sound. Designed to be played with a humbucking pickup they are totally different from a fender based design.

Gibson GA-30(1948)
15Watts 1x8" & 1x12" speaker

Built some two years after Django's 1946/7 American Tour this amp is barely comparable to that which was used by Django to be heard adequately while the Duke Ellington Orchestra wailing alongside him. His must have been a special and who knows perhaps a prototype issued by Gibson to support their Gibson ES300 Guitar used by Reinhart throughout the tour. He wasn't well received by the Ellington Fans who were more than discontent if the band remained silent but for a few riffs and a crescendo during his sets. Django was lone figure without his usual support and Ellington had not written anything special for his unique talents, but there again Django new nothing of Key's or reading Music Notation, didn't speak much English and always played by ear. What an educated ear and a matchless improvisational talent!

Note the 'very large for the times' white Amp to the left of Django with Gibson and that closed striped case at his immediate 'left' which also appears on the La Plar Ballroom Picture with a small black amp connection box stood on edge to the camera.

Anyone have any ideas on this Amplification arrangement - early 'Vibrator' type power unit or pre-amp perhaps. Was it a Seth Lover Special as it closely resembled the much later Fender Amps in size suggesting multiple speakers.

Could the case be the controls and the large White Box just the speaker housing?

The GA 30 must have been about 24 x 18 inches say 610 x 460mm

The GA-30 with a picture frame style speaker opening and dark brown leatherette covering. "New bass tone expander control allows the player to increase resonance and quality of the lower notes, advantageous in instrumental solo work".

First version of the series with 1-12" & 1-8" speaker. Massive magnets made this a very heavy amp.

Has a GREAT low volume Jazz tone that is the Charlie Christian tone all over again with the right guitar.