Holidays.net Online Store

Holdays.net Home


September 28th, 2014
World Rabies Day

September 28th, 2014
Gold Star Mother's Day

September 28th, 2014
World Heart Day

October 1st, 2014
International Day of Older Persons

October 2nd, 2014
International Day of Non-Violence

October 4th, 2014
Feast of St Francis of Assisi

October 4th, 2014
Yom Kippur

October 5th, 2014
Eid-al-Adha

October 5th, 2014
World Teachers' Day

October 6th, 2014
Child Health Day

October 6th, 2014
World Habitat Day

October 8th, 2014
World Day for Natural Disaster Reduction

October 9th, 2014
World Post Day

October 9th, 2014
Leif Erikson Day

October 9th, 2014
World Sight Day

October 9th, 2014
First day of Sukkot

October 10th, 2014
World Mental Health Day

October 11th, 2014
International Day of the Girl Child

October 13th, 2014
Indigenous People's Day

October 13th, 2014
Columbus Day

October 13th, 2014
Native Americans' Day

October 15th, 2014
International Day of Rural Women

October 15th, 2014
Last day of Sukkot

October 15th, 2014
White Cane Safety Day

October 16th, 2014
Shmini Atzeret/Simchat Torah

October 16th, 2014
Boss's Day

October 16th, 2014
World Food Day

October 17th, 2014
'Alaska Day' observed

October 17th, 2014
World Day for Poverty Eradication

October 18th, 2014
Alaska Day

October 23rd, 2014
Diwali/Deepavali

October 24th, 2014
United Nations Day

October 24th, 2014
World Development Information Day

October 25th, 2014
Muharram/Islamic New Year

October 27th, 2014
World Day for Audiovisual Heritage

October 29th, 2014
World Stroke Day

 



Search:

Heathkit Sb-220 Linear Amplifier With Manual For Sale

Heathkit Sb-220 Linear Amplifier With Manual

Taken from the Heathkit SB-220 assembly and installation manual:The Heathkit Model SB-220 Linear Amplifier is a completely self-contained, table top, grounded grid, linear amplifier. It is designed to operate at the maximum amateur power limit on SSB, CW, and RTTY. Its styling matches the Heath SB series of amateur equipment.The Amplifier is designed to be used with exciters which deliver 100 watts or more output. It can be used with less driving power, but will give a lower output.A broad-band, tuned input circuit for each band feeds the two Eimac 3-500Z triode tubes connected in grounded grid configuration. The tube are biased beyond cut-off in the receive mode, and zener-regulated bias controls the idling current in the transmit mode. The tubes are cooled by a fan.An ALC circuit develops negative voltage to be fed back to the exciter to reduce its gain when the Amplifier is overdriven.The antenna changeover relay is normally actuated by exciter relay contacts to place the Amplifier in the transmit mode.The Amplifier can be operated from either 120VAC or 240VAC 50/60Hz lines and can be easily changed from one to the other. Operation from a 240 volt line is recommended. Each side of the line cord is equipped with a circuit breaker to protect against overloads.An important feature of this Amplifier is that it can be tuned up at the one kilowatt limit and can then be switched to operate on SSB at two kilowatts P.E.P. input. As the switching changes both the voltage and current to the final tubes, the impedance remains the same and no additional adjustments of tuned circuits is required.The tubes are "instant heating" types, and transmission may be started as soon as the Amplifier is switched on (after tune-up).Here is a full legal-limit Amplifier that can take its place on your operating table and give you years of trouble-free pleasure. This Amplifier has a commanding Coverage . . . . . . . . . . 80, 40, 20, 15, and 10 meter amateur bands.Driving Power Required . . . . 100 watts.Maximum Power Input . . . . . SSB: 2000 watts CW: 1000 RTTY: 1000 watts.Duty Cycle . . . . . . . . . . . . . . SSB: continuous voice CW: continuous (maximum key-down 10 RTTY: continuous (maximum key-down 10 minutes).Third Order Distortion . . . . . -30dB or better.Input Impedance . . . . . . . . . . 52 ohm unbalanced.Output Impedance . . . . . . . . . 50 ohm SWR 2:1 or less.Front Panel . . . . . . . . . . . . . . Meter CW/Tune -- Plate Multi-meter (Grid mA, Relative Power, High Voltage).Rear Panel . . . . . . . . . . . . . . . Line cord (Note this unit is presently wired for 120VAC Circuit breakers (two Antenna Relay ALC RF Input GROUND RF Output (SO-239).This unit is presently wired for 120VAC operation but can be changed to 240VAC if required. It was last fired up about 10 years ago and tested with a Heath Cantenna dummy load. All functions worked fine at that time, however the unit has not been powered up since and is being sold "as-is" since I have no way to test it again. The extra black wires coming out the back grille area (see pics) are wired in parallel with the internal fan, so you could drive another external AC fan from these for additional cooling. As with all user-built products, it would be beneficial to spend some time cleaning and inspecting the internals, deciphering any mods that may have been made, and possibly powering it up slowly with a variac to allow the unit to "acclimate" since it hasn't been used for so long. It appears to have someone's (Harbach?) parasitic suppression mod installed (see pics) however I cannot be 100% sure as I don't have a mod to compare it with. It may or may not have other Harbach (or others) mods as well (see pics). This is a very clean unit with no discoloration on either of the 3-500Zs that I could see, and the red "Eimac 3-500Z" printing on each tube is perfectly readable and not discolored. The safety interlock appears to be disabled however it looks easy to make functional again if desired. This interlock was designed to short the high voltage to ground in the event the chassis' top cover was removed to provide a safety feature to the user. As internal voltages can reach upwards of 3KV, this unit is not a toy and should be handled by experienced personnel familiar with how to handle high-voltage equipment. FOLLOW ALL WARNINGS PRINTED IN THE ASSEMBLY MANUAL! It is included.This unit is very heavy and will be carefully packed and double-boxed for shipment. At the buyer's option I will remove the finals and pack them to be safely shipped separate from the main box at no extra charge. That can be decided via email after end of sale.

Heathkit Sb-220 Linear Amplifier With Manual

This item has been shown 0 times.

Buy Now

Heathkit Sb-220 Linear Amplifier With Manual:
$701




Millen 10030 Turns Counter (heavy Duty) For Roller Inductors & Vacuum Capacitors picture
Millen 10030 Turns Counter (heavy Duty) For Roller Inductors & Vacuum Capacitors


Heathkit Hd-1416 Code Oscillator & Straight Key picture
Heathkit Hd-1416 Code Oscillator & Straight Key


2 Units Of Dual Solid State Hf Power Linear Amplifier With Splitter & Combiner picture
2 Units Of Dual Solid State Hf Power Linear Amplifier With Splitter & Combiner


Mfj-112 Radio Dxer's  World Time Map Clock+instructions  picture
Mfj-112 Radio Dxer's World Time Map Clock+instructions


Vintage Tentec 245 Electret Microphone picture
Vintage Tentec 245 Electret Microphone


Bird Electric Corp Low Pass Rf Filter, Mod 521, 400 Mhz Cut Off Ham Radio Vtg picture
Bird Electric Corp Low Pass Rf Filter, Mod 521, 400 Mhz Cut Off Ham Radio Vtg


Astron Rs-35a 35 Amp Regulated Power Supply Heavy Duty-excellent-tested  picture
Astron Rs-35a 35 Amp Regulated Power Supply Heavy Duty-excellent-tested


Lot  Of 7 Hamtonics 2m, 70cm Transmitters And Receivers picture
Lot Of 7 Hamtonics 2m, 70cm Transmitters And Receivers


Mfj - 1026 Deluxe Noise Canceling Signal Enhancer picture
Mfj - 1026 Deluxe Noise Canceling Signal Enhancer


Microlab /fxr Directional Coupler Model Cb-b15, Fsn 2z5985-3851, Estate Find Vtg picture
Microlab /fxr Directional Coupler Model Cb-b15, Fsn 2z5985-3851, Estate Find Vtg