Hy-Gain DX88 Antenna Repair

IMG_20151107_121130Added a new project to the website, a Hy-Gain DX88 Antenna that needed some repair to return it to working condition. It was simple work that took about an hour and this improved the tuning of the antenna to normal values. It’s a nice low angle of radiation vertical antenna that works on all bands except 160 Meters.

 

Re-Installed Base

Re-Installed Base

This base was the culprit and it has a crack in it. It also made poor connection to the radiation element from the feed point. So some TLC was in order.

I describe in detail the things I did on a separate page on the site labelled Hy-Gain DX88 Antenna Repair from the Menu above.

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5E3 Fender Prototype 3 Amp Project

I have started another 5E3 amp project that is following in the footsteps of my last two guitar amps. This is to make changes in the way I build the last 5E3 project and make things a bit better. I hope to have this completed to go into a cabinet that I will have made for this amp. The aluminum chassis is covered in green masking tape to protect the aluminum from being all scratched up. I like to make polished aluminum surfaces afterward with some aluminum polishing compound so the less scratches there are the better. I will be updating this build in a thread that can be found from the main menu.

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Testing Components

Testing Components

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Greatest Music Teacher Ever…

JustNickMusic

Just Nick Music

JustNickMusic

I have been following Nick for some time now and I have enjoyed his methods of instruction. Well managed lesson delivery and presentation with great explanations, technical descriptions and great music entertainment. Even if you can’t play a lick, like me, I found that I even learned stuff that was interesting about music that Nick covers. With my interest in Amplifiers, and Electronics, Sounds and Music, I enjoy what Nick has to say. I was a drummer in my long past so I get that, so watching Nick integrate his brand of sound and percussion background sounds from his PC is fun to listen to.   Meanwhile, you will get a kick over Nick’s brand of humor and his straight forward delivery of music and jokes that will make you remember stuff that he is teaching. Included in some of his videos are information videos about electronics that relate to guitar amplifiers and sound systems that you will find very informative.

Stop over at JustNickMusic on YouTube and learn something that you never knew about electronics, sound recording, music and guitar playing.

Just watching Nick play guitar is worth every penny.

http://www.youtube.com/user/JustNickMusic

 

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Linear Amplifier Repair and Radio Repair for the Amateur Radio Community

I have begun to take on work in Linear Amplifier Repair and Radio repair for the Amateur Radio Community. This is a list of Amps and Radios that I have made operational repairs on during the past year. I have begun to incorporate solid state circuitry into my area of expertise and now can diagnose the RM Italy line of solid state amps.

Brands listed below are part of my experience.

  • Ameritron AL-80B replaced a 10 watt 10 ohm power resistor controlling the power supply input control relay.
  • Viewstar PT-2500A    2 x 3-500Z tubes. Output network failure and repair.
  • Yaesu FL2100B Blocking Capacitor replacement and installed 2 new 572B tubes.
  • Yaesu FL2000B overall inspection and testing. Weak tubes need replacing. Two 572B’s
  • Yaesu FT-101EE Tube replacement, Neutralization and general alignment.
  • Yaesu FT-101E Power supply resistor replacement.
  • Ameritron AL-811 Had burned traces on the power supply section of the DC side of the supply, Repaired. Installed new tubes.
  • Ameritron AL-811 Replaced Tubes and Tested.
  • Ameritron AL-811H No Transmit, High Input SWR on transmit. Tubes failed and four grid resistors were failed. All replaced with new parts.
  • RM Italy KL505 Solid State linear amplifier,  Failed, shorted power transistor. Replaced.
  • Icom 701 Receive and Transmit alignment was off. Re-calibrated as per service manual.
  • Kenwood TS-180 Output Amplifier sections.
  • Sound Design Model 4491C repaired output transistor.
  • TJ4A YouKits HF 4 Band Transceiver PTT TR/RX switching repair.

Other projects I am open for repair services.

 

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Klipsch BASH 4.1 Repair

Back Plate

Back Plate

This system had a bad common mode hum into the output at 60HZ and was very loud. After some search on the internet, I found a solution and improved the situation.

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Completed a 12 volt Power Supply

Just this last while I was presented with a small hobby enclosure from the 1970’s made by Hammond.

Powered on.

Powered on.

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Sound Design 4491C Stereo Multiplex

Repaired and cleaned up a nice Stereo AM/FM 8 Track Player that had a bad output on the left channel.

Sound Design Composite Multiplex Stereo PlayerSound Design Composite Multiplex Stereo Player
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6AQ5 2 Watts a Side Stereo Amplifier

Latest project is a Stereo Amplifier for my MP3, CD Player and output to some desktop speakers or my headphones.  Using 12AX7, to a 6AQ5 Single Ended output one for each Left and Right channel. Power supply is a full wave 6X4 rectifier tube and a 270 VAC Transformer.

Updated Power Transformer

Updated Power Transformer

 

 

 

 

 

 

 

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5E3 Fender Project 2 Completed

Completed the 5E3 Fender Project 2 today, and the testing went much smoother than expected. I had to rewire all my jacks as the pin outs on the jacks I have here are reversed from the standard switchcraft type jacks. This was a bit of a surprise but once it was adjusted for it tested up fine. This amp is way more powerful than the last amp project with higher plate voltages that are more typical of Fender amps.

Now I will take it to the local music store that I help with amp repairs and get the guitar guys that can play there give it a workout.

Well that session was received well and the tests went much better than expected.

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Finding Parts

I don’t know about you, but the thing that drives me nuts the most is finding resistors and capacitors of the right value and rating. Before, in solid state circuits, we gave little thought to ratings. In guitar amps you have to observe max voltage ratings and pick components with reasonable voltages. I try to scrounge these parts but the more I do this amp stuff the more I have to go out and buy these components. At least with new parts I can feel better about good performance. As I move away from prototype designs, I will use less recycled parts. If I decide to stabilize a project to duplicate it, I will look for parts that I can get that are acceptable and reasonable cost. In the long run, I think that custom amps will not be built just to save some money on a new amp. But more to get something unique and built to personal taste.

 

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