Tektronix Type 190B Constant Amplitude Signal Generator w/ Attenuator & Manual, US $1401 – Picture 0

Tektronix Type 190B Constant Amplitude Signal Generator w/ Attenuator & Manual, US $1401 – Picture 1

Tektronix Type 190B Constant Amplitude Signal Generator w/ Attenuator & Manual, US $1401 – Picture 2

Tektronix Type 190B Constant Amplitude Signal Generator w/ Attenuator & Manual, US $1401 – Picture 3

Tektronix Type 190B Constant Amplitude Signal Generator w/ Attenuator & Manual, US $1401 – Picture 4

Tektronix Type 190B Constant Amplitude Signal Generator w/ Attenuator & Manual, US $1401 – Picture 5

Tektronix Type 190B Constant Amplitude Signal Generator w/ Attenuator & Manual, US $1401 – Picture 6

Tektronix Type 190B Constant Amplitude Signal Generator w/ Attenuator & Manual, US $1401 – Picture 7

Tektronix Type 190B Constant Amplitude Signal Generator w/ Attenuator & Manual, US $1401 – Picture 8

Tektronix Type 190B Constant Amplitude Signal Generator w/ Attenuator & Manual, US $1401 – Picture 9

Tektronix Type 190b Constant Amplitude Signal Generator W/ Attenuator & Manual

US $1401

Carpinteria, California, United States
Jun 9th

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This auction is for a vintage Tektronix Type 190B Constant Amplitude Signal Generator with Type 190B Attenuator and a copy of the manual in good condition. It has several tubes including two Amperex 12AU7, one RCA 6C4, two RCA 6AU6, one RCA OB2 and one RCA 5Y3GT. The Tektronix Type 190B Constant Amplitude Signal Generator is a sine wave source that uses feedback to provide a signal whose amplitude does not vary with frequency or with the impedance of the load, within stated limits. The frequency range is 350 kHz to 50 MHz. The amplitude measurement is made using a peak-to-peak (envelope) detector in an external attenuator head that is connected to the main unit by a special cable. The 190B uses two 1N87A germanium diodes for the detector. The 190 is useful for measuring the frequency response of a device whose input impedance varies with frequency. If a standard 50-ohm signal generator is used for this purpose, the frequency-domain variations of the input impedance of the device under test will result in frequency-domain variations in the actual signal voltage that is applied to the input. This interaction between is input impedance and gain measurements is often undesirable. Having a constant-amplitude source simplifies the measurement. The oscillation frequency of the 190B is controlled by a rotary variable capacitor. The variable capacitor rotates together with a drum that serves as the frequency readout dial. The drum is made of cream colored plastic and has a diameter of 5" (12.5cm) and a height of 4" (10cm). The frequency knob on the front panel of the 190B turns a rubber wheel which, by friction, turns the drum. The relatively large diameter of the drum provides for precise frequency control, long effective length of the readout dial, and ensures that the friction coupling between the frequency knob and the drum provides sufficient torque to turn the drum and rotary capacitor without any slippage. Please note that since this is a vintage piece it may need some calibration and I am selling this AS-IS. I will include the factory calibration procedure (behind the printed manual). The winning bidder will receive what is pictured. Quoted shipping applies to lower USA only. Alaska, Hawaii, Puerto Rico and all other US Territories pay a higher shipping cost due to their location(s). International bidders are welcomed and will also pay for shipping via the Global Shipping Program. BUY IT NOW!! International Bidders Welcomed!! Terms and Conditions: Please note that by bidding on my auction you are agreeing to my terms and conditions and that you agree with them. Please inspect ALL of the photos carefully. I rely on you to do this because I can try very hard to describe the physical condition of an item but my description might differ from yours. I rely on the photos for a full description of the condition of the item and you can see for yourself EXACTLY what you are getting. I take many photos for a reason and this is it. Please ASK questions BEFORE placing your bid if you are not sure of something. Remember the eBay rules: If you bid on an item, you are entering into an agreement with me and I will assume you understand and agree with the terms of the sale. I usually use USPS or UPS or FedEx for shipments which includes International shipping. PLEASE NOTE THAT I AM NOT RESPONSIBLE FOR ANY TARIFFS, CUSTOMS FEES OR ANY OTHER EXTRA FEES YOUR COUNTRY MAY CHARGE YOU FOR DELIVERY. I do everything I can to make sure your item arrives in a timely and safe manner HOWEVER I am not responsible for (nor can I control) shipment delays as I have no control over the shipping process. All of my items are sold "AS-IS" with no warranty and unless you receive an item not as described, I accept no returns. If there are any issues, problems or concerns with your item, please contact me first immediately. Simply click on "Ask Seller a question" link above. I promise I will work with you to resolve any issue(s) which includes any refunds, returns, etc. Please, please, please DO NOT leave negative feedback or file a complaint with eBay or Paypal. Give me a chance to resolve the issue to your satisfaction. Customer service is my number one priority. And finally, please keep in mind that I am not a new seller. I've been selling on eBay for several years now. I usually do not sell brand new items but rather I sell some of the most difficult items such as vintage electronics, vintage audio gear, vintage speakers, difficult to describe items, etc. So, I rely on YOU the buyer to know what you are bidding on. And, while I make every effort to accurately describe my items, I only ask that you carefully inspect all of the photos and ask me any questions before bidding. So, let's have fun and HAPPY BIDDING EVERYONE!!