Fryette 2150 User manual

2150
POWER AMPLIFIER
MODEL G2150S
OWNERS MANUAL

Unpacking
Inspect your 2150 power amp for hidden damage that may have occurred in transit. Your amp was inspected and
sound-tested before shipment from the factory. All claims for shipping damage must be made by the receiver.
Save your box and packing material for evidence of damage if it has occurred.
Packing Materials
The original box and packing materials are specifically designed to protect your amp during shipment. SAVE ALL
PACKING MATERIALS. In the unlikely event that your amp needs to be returned to the factory, the original box
and packing materials will be necessary for shipment. These are carrier-approved packing materials, and they will
ensure safe transit back to the factory.
WARNING: Cautions
Save these instructions for later use.
Follow all instructions and warnings marked on the unit.
Always use with the correct line voltage. Refer to the manufacturer's operating instructions for power
requirements. Be advised that different operating voltages may require the use of a different line cord and/or
attachment plug.
Do not install the unit in an unventilated rack, or directly above heat producing equipment such as power
amplifiers. Observe the maximum ambient operating temperature listed in the product specification.
Slots and openings on the case are provided for ventilation; to ensure reliable operation and prevent it from
overheating, these openings must not be blocked or covered. Never push objects of any kind through any of the
ventilation slots. Never spill a liquid of any kind on the unit.
This product is equipped with a 3-wire grounding type plug. This is a safety feature and should not be defeated.
Never attach audio power amplifier outputs directly to any of the unit's connectors.
To prevent fire or shock hazard, do not expose this unit to rain or moisture, or operate it where it will be exposed
to water.
Do not attempt to operate the unit if it has been dropped, damaged, exposed to liquids, or if it exhibits a distinct
change in performance indicating the need for service.
This unit should only be opened by qualified service personnel. Removing covers will expose you to hazardous
voltages.
The lightning flash with arrowhead symbol,
within an equilateral triangle, is intended to
alert the user to the presence of
uninsulated “dangerous voltage” within the
product’s enclosure that may be of
sufficient magnitude to constitute a risk of
electric shock to persons
WARNING
RISK OF
ELECTRIC SHOCK
DO NOT OPEN
The exclamation point within an
equilateral triangle is intended to alert
the user to the presence of important
operating and maintenance (servicing)
instructions in the literature
accompanying the product.

ii
Fryette Amplification 6850 Vineland Avenue North Hollywood, CA 9 605
Phone: [phone] Email: [email protected]
Table of Contents
Unpacking ............................................................................................................................................................ii
Packing Materials.................................................................................................................................................ii
Cautions ...............................................................................................................................................................ii
Foreword............................................................................................................. 4
Section 1 Product Overview ................................. Error! Bookmark not defined.
Introduction.......................................................................................................... Error! Bookmark not defined.
Front Panel Control Functions ............................................................................ Error! Bookmark not defined.
Rear Panel Controls.............................................................................................................................................5
Section 2 Installation and Operation..................... Error! Bookmark not defined.
Installation Notes..................................................................................................................................................7
Before Applying Power Check The Following: ............................................. Error! Bookmark not defined.
Speaker Connection ..................................................................................... Error! Bookmark not defined.
Impedance Settings .................................................................................................................. Error! Bookmark not defined.
Special impedance mismatching exceptions for the 2 50 ........................................................ Error! Bookmark not defined.
Ventilation ..................................................................................................... Error! Bookmark not defined.
Section 3 Maintenance and Service ..................... Error! Bookmark not defined.
TIPS - Tube and Fuse Replacement............................................................ Error! Bookmark not defined.
Description of Fuse-Types............................................................................ Error! Bookmark not defined.
How To Replace Fuses ................................................................................ Error! Bookmark not defined.
Tube-Types................................................................................................... Error! Bookmark not defined.
Tube Location Chart ..................................................................................... Error! Bookmark not defined.
How To Replace Tubes ................................................................................ Error! Bookmark not defined.
Section 4 Connection Tips.................................... Error! Bookmark not defined.
Building A Load Box............................................................................................ Error! Bookmark not defined.
Load Box Schematics................................................................................... Error! Bookmark not defined.
Section 5 Troubleshooting.................................... Error! Bookmark not defined.
Amplifier Will Not Turn On: ...................................................................................................................... 12
No Sound (one or both channels): ............................................................ Error! Bookmark not defined.
Amplifier Is Running Hot: ........................................................................... Error! Bookmark not defined.
Amplifier Is Sounds Distorted: ................................................................... Error! Bookmark not defined.
Section 6 Specifications .................................................................................... 10
Section 7 Warranty............................................... Error! Bookmark not defined.

Foreword
Congratulations. You have purchased unquestionably the finest musical instrument amplifier available!
Your new Fryette Power Amplifier incorporates a unique combination of state-of-the-art electronics and time-
honored audio design. Meticulous craftsmanship coupled with only the highest-quality components assures
decades of trouble-free performance.
Before power-up, please take a few moments to familiarize yourself with this manual and discover the impressive
features and flexibility of the 2150 Power Amplifier. You will also find out how you can achieve maximum
performance from your Fryette product with a minimum of basic maintenance and operational information.
As always, PLEASE observe normal safety precautions when operating this equipment and pay particular
attention to the caution and warning designations in this manual and on the amplifier chassis. These simple
precautions are intended for the extended useful life of the equipment and, more important, of the operator.
Serial Number:
Date of Purchase:
Dealer Name:
From the entire staff of Fryette Amplification, we thank you for your support and look forward to assisting you in
your quest for killer sound.
Steven M. Fryette
President
Fryette Amplification

PRODUCT OVERVIEW
FRONT PANEL
LEFT TO RIGHT
1. STANDBY - (Channel A) I = Half Power. 0 = Standby. II = Full Power. Disconnects power to channel A
when idling.
2. VOLUME - (Channel A) Normal setting for best signal to noise will be 10 o’clock to 2 o’clock.
3. LEVEL - (Channel A) Push button switch for controlling input signal level; Out = -10dB, In = 0dB
4. PRESENCE - (Channel A) High-frequency boost/cut. The higher the frequency, the more active this control
appears to be.
5. VOICING - Push button switch for controlling input signal level; Out = -10dB, In = 0dB
6. DEPTH - (Channel A) Variable damping control. The lower the frequency, the more active this control
appears to be.
7. FAN - HI-LO. Adjusts cooling rate. Set to “HI” for most playing conditions.
8. A FUSE - 1 amp fuse – “normal-blo”. DC power supply and output protection fuse for Channel A.
9. MAINS - I = On, 0 = Off. This is the primary AC power switch for both channels and the fan.
10. MAINS FUSE - 10 amp fuse – “slo-blo”. This is the primary AC protection fuse for both channels and the
fan.
11. B FUSE - 1 amp fuse – “normal-blo”. DC power supply and output protection fuse for Channel B.
12. VOLUME - (Channel B) Normal setting for best signal to noise will be 10 o’clock to 2 o’clock.
13. LEVEL - (Channel B) Push button switch for controlling input signal level; Out = -10dB, In = 0dB
14. PRESENCE - (Channel B) High-frequency boost/cut. The higher the frequency, the more active this control
appears to be.
15. VOICING - (Channel B) - Push button switch for controlling input signal level; Out = -10dB, In = 0dB
16. DEPTH - (Channel B) - Variable damping control. The lower the frequency, the more active this control
appears to be.
17. STANDBY - (Channel B) = Half Power. 0 = Standby. II = Full Power. Disconnects power to channel B when
idling.

REAR PANEL
LEFT TO RIGHT
1. AC INPUT SOCKET – This amplifier is equipped with a grounding-type supply cord to reduce the possibility of
leakage current. Be sure to connect it to a grounded receptacle.
Use only the factory supplied cord set or a UL approved equivalent type.
2. IMPEDANCE SELECTOR – (Channel B) The impedance of a speaker or combination of speakers must equal
the value set on the “Impedance Select” switch for each channel. See Installation and Operation.
3. SPEAKER OUTPUTS – (Channel B) The speaker output jacks are wired in parallel. Note: A channel will not
operate unless the jack labeled “Use First” is used first!
4. IMPEDANCE SELECTOR - Upper selector for Channel A amplifier- set for 4, 8, or 16 Ohm loads.
5. INPUT A/MONO and B- Input signal is fed to the input sensitivity switch, then to the volume control. Signal fed
to the the “A/MONO” input automatically “normals” (connects directly) to the B input when the B input jack is
not connected – Both channels outputs must still be connected to separate speaker systems.
6. SPEAKER OUTPUTS – (Channel A) The speaker output jacks are wired in parallel. Note: A channel will not
operate unless the jack labeled “Use First” is used first!
7. IMPEDANCE SELECTOR – (Channel A) The impedance of a speaker or combination of speakers must equal
the value set on the “Impedance Select” switch for each channel. See Installation and Operation.

INSTALLATION AND OPERATION
Installation Notes
Before Applying Power Check the Following

Unit is connected to the correct voltage source with a proper 3-wire grounded outlet. Use only the AC cord provided.

Cooling vents are free from obstruction.

Speakers are plugged into the correct output jacks using minimum 18-gauge speaker cable. DO NOT USE
SHIELDED CABLE.

“Impedance” selector is at correct setting. See Speaker Connection.

“Fan” speed switch is set at “Hi.”

“Standby” switches are set to OFF (“0”) position.
CAUTION: Due to the high power output of this equipment, it is important to be aware that electrical safety
as well as sonic quality can be severely compromised by the use of substandard or underrated power sources.
Do not use ungrounded outlets, multiple outlets and/or extension cords smaller than 18 gauge.
Speaker Connection
It is extremely important to select the proper impedance setting for the speaker system(s) used. This setting is
determined separately for each channel.
Impedance Settings
One 16-ohm speaker (in Channel A) = Selector Setting “16”
One 8-ohm or two 16-ohm cabinets = Selector Setting “8”
One 4-ohm or two 8-ohm cabinets = Selector Setting “4”
Do not mismatch impedance on the 2150. Some manufacturers represent impedance mismatching as an
optional tone-modifying technique. Due to the extremely high power output and dynamic range of the 2150,we
strongly advise against this practice.
Special impedance mismatching exceptions for the 2150. The one exception to this rule applies to the
operation of the 2150 series in the low-power setting.
In low-power, with the Standby switch set at “1”, the “IMPEDANCE SELECT” settings are divided by two for a
correct match. (see example below)
Example: 2150 series “impedance mismatch” correction to ensure proper speaker/amplifier interaction for low-
power setting.
One 8-ohm or two 16-ohm cabinets = Selector Setting “16”
One 4-ohm or two 8-ohm cabinets = Selector Setting “8”
CAUTION: Failure to observe proper impedance setting may significantly shorten tube life and/or cause
severe damage to the amplifier.

Installation Notes – continued
Ventilation
The cooling system in the 2150 is designed to draw heat out of the enclosure and provide the maximum amount
of cooling for the power dissipated in the enclosed space.
Occasionally, when recording or performing in a quiet environment, fan noise may be a problem. Under these
circumstances, the “LO” fan speed may be used.
To set the fan to “LO”, gently insert the proper size screwdriver into the switch slot and rotate the switch to the left
(counterclockwise) until a click is heard.
Turning the switch in the wrong direction or attempting to force the switch past its indent point may cause
permanent damage to the switch.
Return the fan’s switch to the setting to the HI” speed position once normal or high volume operation has
resumed.
CAUTION: Operation of the amplifier at its “HI” volume settings with the fan set at “LO” may result in
severely shortened tube life!

MAINTENANCE AND SERVICE
Proper maintenance and routine servicing will assure continued top-notch performance from your FRYETTE 2150
amplifier. Generally, we prefer that routine service and tube replacement are performed by your FRYETTE dealer
or service outlet.
TIPS – Tube and Fuse Replacement
•Wait at least 5 minutes before attempting tube or fuse replacement, to allow time for tubes to cool off and
hazardous voltages to drain off.
•When replacing tubes, remove only the top cover.
CAUTION: the fan cord must be disconnected before the cover can be completely removed. This is
accomplished by simply removing the fan plug at the top of the fan. Care must be taken to prevent strain on the
fan cord when replacing the cover.
How to Replace Fuses
When replacing fuses, gently push the fuse post in and turn slightly to the left with the proper size screwdriver.
Then gradually release the pressure to avoid stripping or fuse holder breakage.
CAUTION: To reduce risk of fire, replace only with same type of fuse.
2150 Tube Guide
The 2150 tube compliment consists of eight Fryette Premium Matched EH KT88 power tubes, two Ruby Selected
HG12AX7s, and two Ruby Selected HG12AU7s. Fryette Premium Selected electronic tubes provide optimum
performance in this amplifier. For best results, replace only with original equipment tubes.
Tube Location Chart
How To Replace Tubes
Gently rotate tubes out of their sockets so as to avoid stress on the contacts and possible tube breakage.
Note tube pin orientation so as to facilitate correct replacement of the tube in its socket. NEVER FORCE A TUBE
INTO ITS SOCKET.
CAUTION: Hot tubes! Hazardous Voltages!
IMPORTANT: Refer all other service and maintenance operations to qualified service personnel. There are
no user serviceable parts inside. To avoid risk of shock, do not remove the bottom or top covers.

CONNECTION TIPS
Building A Load Box
Have you ever wondered what that treasured old tweed Deluxe would sound like as a 200-watt powerhouse?
Here’s a simple load box/output pad configuration that will allow you to drag out all your favorite antiques out of
the closet and really go for a spin.
Just connect the speaker output from your source amplifier to the input of this load box, and then connect the
variable line output of the load box to the A/MONO input of your FRYETTE 2150 or CLASSIC XXX amplifier.
S1 must be closed when no speaker is connected to the amplifier.
R1’s value will be determined by the source amplifier’s impedance rating.
Parts List
J1, J2 – Mono ¼” phone jack
S1 – SPST (Single-pole/single-throw) heavy-duty toggle switch
R1 – 4,8, or 16 ohm, 100-watt resistor (Dale NH 100 or equivalent)
R2 – 2,200 ohm, ½ watt resistor
R3 – 470 ohm, ½ watt resistor
VR1 10K ohm audio-taper potentiometer