Motorboating; what is it, 'why?', and how to fix it?
Motorboating is a low frequency oscillation, often due to feedback though the power supply. Coupling caps shouldn't be too big, power supply filters may have to be larger if your supply has more droop than Fender's original.
Gow to resolve a "motorboating" problem
The radio is now working and receives very well AM stations. No hum but there is "motorboating" that disappears when the volume knob is turned close to maximum. When the volume is lowered "motorboating" appears again. I checked the volume control variable resistor with the ohmeter and seems to be ok. Three of the tubes (77, 78 and 6A7) have ...
PDF No. 23
No. 23 - How To Fix a Receiver That Squeals and Motorboats. Title. No. 23 - How To Fix a Receiver That Squeals and Motorboats. Author. NRI - National Radio Institutes, 1949; Scanned by Mike Yancey, 2012. Subject. No. 23 - How To Fix a Receiver That Squeals and Motorboats. Keywords.
Fixing Unwanted Radio IF Oscillation and Motorboating
This video walks through 2 issues regarding older tube era radio repair:1) Recognizing, Diagnosing and Fixing unwanted IF transformer feedback and oscillatio...
Motorboating (electronics)
Motorboating (electronics) In electronics, motorboating is a type of low frequency parasitic oscillation (unwanted cyclic variation of the output voltage) that sometimes occurs in audio and radio equipment and often manifests itself as a sound similar to an idling motorboat engine, a "put-put-put", in audio output from speakers or earphones. [1 ...
What is mean by "motorboating"?
Smyrna, Tennessee. Jul 15, 2010. #6. zz0468 said: "motorboating" is a low frequency oscillation that resembles a motorboat putt-putting along. The term predates anything digital by about 6 decades or so. Did motorboating have the same meaning BEFORE digital, but not caused by digital apparatus?
TRC-495 CB Radio Motorboating Noise
Mid 1990's Radio Shack TRC-495 Base CB Radio Catalogue No. 21-1579 with a Motorboating noise, ultimately sent for repair, caused by a bad capacitor. Initiall...
What causes "motorboating"?
Tucson, AZ. Dec 27, 2008. #11. Skypilot007 said: ...If you're getting the motorboating sound for an entire transmission then its probably a weak signal on that particular voice channel that your scanner is not decoding. This sounds like what is most likely happening.
Motorboating 1948 Sparton 121
Motorboating 1948 Sparton 121 AM/FM Radio. Originally uploaded as an unlisted video for members of the Antique Radio Forum. Update: Replacing the 6BA6 FM ...
What causes "Motorboating"????
High frequency oscillation is caused by phase shifts and inadvertent feedback at high frequencies. Motorboating is the equivalent at low frequencies. It's caused by series capacitors between stages and a lack of power supply isolation between stages. The input to a capacitor coupled stage is an RC highpass network.
Motorboating Noise
Motorboating is a low frequency oscillation caused by feeback between stages of a radio. Usually caused by bypass caps or lack of tube shields. Does your 6D6 and 6Q7 have shields.
Motorboating: What exactly is it?
Motorboating is a low frequency oscillation. There are numerous causes. Many are related to capacitors or high impedance power supplies (flat batteries). You need to look at the supply rails to see if they are fluctuating in time to with the motorboating because one cause is coupling between the amplifier and the power supply -- this can ...
General Faults In Vintage Radio
The radio may have failed in 1950 and been put on a shelf, so you may possibly have several faults, the original one, and the age effects. ... If the radio produces a funny burping sound (called "motorboating"), it is usually feedback between stages, coupled by the HT or AGC line, so suspect faulty screen, high tension or AGC bypass capacitors. ...
What Does Motorboating Sound Like?
Joined. Feb 6, 2007. Messages. 6,034. Apr 26, 2008. #5. It's a low frequency oscillation that can sound like someone blowing rasperries, ir can even sound like a very low note played on a tuba. If the frequency is really low, it an sound like a small engine putting.
From the Q and A
Motorboating Radio Question: I have an old Minerva radio — at least that's what it says on the little plate just below what used to be a glass dial that runs across the top of the radio. I would like to get this up and running, but have no schematic or even a model number to give you. It is a tube-type radio with six tubes and two rectangular ...
Motorboating
The amplifier is a ECL80. I applied a signal from my record turn table to the grid of the triode section, via its coupling capacitor (0.01uf) and the volume would rightly be described as loud. However the motorboating doesn't go away when I apply the input signal and it distorts the audio of course so Status Quo sounds like a Dalek convention.
German Greatz Polka Tube Radio Video#6
A lucky observation saves a lot of troubleshooting and leads to a simple solution to the motorboating oscillation in the radio. Very lucky.
Crash of a Tupolev TU-104B in Omsk
Circumstances: While descending to Omsk Airport, the crew encountered poor weather conditions and low visibility due to snow showers. On final, as he was unable to locate the runway, the captain abandoned the approach and initiated a go-around. Three other attempts to land were abandoned within the next minutes.
Aeroflot Flight 3352
Aeroflot Flight 3352 was a regularly scheduled Aeroflot domestic flight in the Soviet Union from Krasnodar to Novosibirsk, with an intermediate landing in Omsk.While landing at Omsk Airport on Thursday, 11 October 1984, the aircraft crashed into maintenance vehicles on the runway, killing 174 people on board and four on the ground. While a chain of mistakes in airport operations contributed to ...
Omsk Refinery
In 1949, Soviet authorities approved the decision to construct a new oil refinery near the city of Omsk. [4] This refinery first started operations on 6 September 1955, [5] and began processing gasoline by 1959. [6] It was subordinate to the Ministry of Oil Industry from 1951 to June 1957, then to the Omsk Sovnarkhoz's Oil Industry Directorate from July 1957 to 1962.
Ust-Ishimsky District
Ust-Ishimsky District (Russian: Усть-Иши́мский райо́н) is an administrative and municipal district (), one of the thirty-two in Omsk Oblast, Russia.It is located in the northwest of the oblast.The area of the district is 7,846 square kilometers (3,029 sq mi).} Its administrative center is the rural locality (a selo) of Ust-Ishim, which, as its name indicates, [how?] is ...
COMMENTS
Motorboating is a low frequency oscillation, often due to feedback though the power supply. Coupling caps shouldn't be too big, power supply filters may have to be larger if your supply has more droop than Fender's original.
The radio is now working and receives very well AM stations. No hum but there is "motorboating" that disappears when the volume knob is turned close to maximum. When the volume is lowered "motorboating" appears again. I checked the volume control variable resistor with the ohmeter and seems to be ok. Three of the tubes (77, 78 and 6A7) have ...
No. 23 - How To Fix a Receiver That Squeals and Motorboats. Title. No. 23 - How To Fix a Receiver That Squeals and Motorboats. Author. NRI - National Radio Institutes, 1949; Scanned by Mike Yancey, 2012. Subject. No. 23 - How To Fix a Receiver That Squeals and Motorboats. Keywords.
This video walks through 2 issues regarding older tube era radio repair:1) Recognizing, Diagnosing and Fixing unwanted IF transformer feedback and oscillatio...
Motorboating (electronics) In electronics, motorboating is a type of low frequency parasitic oscillation (unwanted cyclic variation of the output voltage) that sometimes occurs in audio and radio equipment and often manifests itself as a sound similar to an idling motorboat engine, a "put-put-put", in audio output from speakers or earphones. [1 ...
Smyrna, Tennessee. Jul 15, 2010. #6. zz0468 said: "motorboating" is a low frequency oscillation that resembles a motorboat putt-putting along. The term predates anything digital by about 6 decades or so. Did motorboating have the same meaning BEFORE digital, but not caused by digital apparatus?
Mid 1990's Radio Shack TRC-495 Base CB Radio Catalogue No. 21-1579 with a Motorboating noise, ultimately sent for repair, caused by a bad capacitor. Initiall...
Tucson, AZ. Dec 27, 2008. #11. Skypilot007 said: ...If you're getting the motorboating sound for an entire transmission then its probably a weak signal on that particular voice channel that your scanner is not decoding. This sounds like what is most likely happening.
Motorboating 1948 Sparton 121 AM/FM Radio. Originally uploaded as an unlisted video for members of the Antique Radio Forum. Update: Replacing the 6BA6 FM ...
High frequency oscillation is caused by phase shifts and inadvertent feedback at high frequencies. Motorboating is the equivalent at low frequencies. It's caused by series capacitors between stages and a lack of power supply isolation between stages. The input to a capacitor coupled stage is an RC highpass network.
Motorboating is a low frequency oscillation caused by feeback between stages of a radio. Usually caused by bypass caps or lack of tube shields. Does your 6D6 and 6Q7 have shields.
Motorboating is a low frequency oscillation. There are numerous causes. Many are related to capacitors or high impedance power supplies (flat batteries). You need to look at the supply rails to see if they are fluctuating in time to with the motorboating because one cause is coupling between the amplifier and the power supply -- this can ...
The radio may have failed in 1950 and been put on a shelf, so you may possibly have several faults, the original one, and the age effects. ... If the radio produces a funny burping sound (called "motorboating"), it is usually feedback between stages, coupled by the HT or AGC line, so suspect faulty screen, high tension or AGC bypass capacitors. ...
Joined. Feb 6, 2007. Messages. 6,034. Apr 26, 2008. #5. It's a low frequency oscillation that can sound like someone blowing rasperries, ir can even sound like a very low note played on a tuba. If the frequency is really low, it an sound like a small engine putting.
Motorboating Radio Question: I have an old Minerva radio — at least that's what it says on the little plate just below what used to be a glass dial that runs across the top of the radio. I would like to get this up and running, but have no schematic or even a model number to give you. It is a tube-type radio with six tubes and two rectangular ...
The amplifier is a ECL80. I applied a signal from my record turn table to the grid of the triode section, via its coupling capacitor (0.01uf) and the volume would rightly be described as loud. However the motorboating doesn't go away when I apply the input signal and it distorts the audio of course so Status Quo sounds like a Dalek convention.
A lucky observation saves a lot of troubleshooting and leads to a simple solution to the motorboating oscillation in the radio. Very lucky.
Circumstances: While descending to Omsk Airport, the crew encountered poor weather conditions and low visibility due to snow showers. On final, as he was unable to locate the runway, the captain abandoned the approach and initiated a go-around. Three other attempts to land were abandoned within the next minutes.
Aeroflot Flight 3352 was a regularly scheduled Aeroflot domestic flight in the Soviet Union from Krasnodar to Novosibirsk, with an intermediate landing in Omsk.While landing at Omsk Airport on Thursday, 11 October 1984, the aircraft crashed into maintenance vehicles on the runway, killing 174 people on board and four on the ground. While a chain of mistakes in airport operations contributed to ...
In 1949, Soviet authorities approved the decision to construct a new oil refinery near the city of Omsk. [4] This refinery first started operations on 6 September 1955, [5] and began processing gasoline by 1959. [6] It was subordinate to the Ministry of Oil Industry from 1951 to June 1957, then to the Omsk Sovnarkhoz's Oil Industry Directorate from July 1957 to 1962.
Ust-Ishimsky District (Russian: Усть-Иши́мский райо́н) is an administrative and municipal district (), one of the thirty-two in Omsk Oblast, Russia.It is located in the northwest of the oblast.The area of the district is 7,846 square kilometers (3,029 sq mi).} Its administrative center is the rural locality (a selo) of Ust-Ishim, which, as its name indicates, [how?] is ...