- #1
Planobilly
- 440
- 105
A second look at a first impression of electronics.
When I decide to take up electronics repair of vacuum tube amplifiers as a hobby I had little idea of what I would need to learn. There were many ups and downs in the process. None the less, within a relative short period of time I found I was able to repair amps. Some were pretty easy and others were a bit perplexing.
I got a lot of help here on the Physics Forum,so thanks to everyone.
I assumed that these devices were not too very complex. Although the circuits are not difficult to understand, this old technology is anything but simple. Detailed Information concerning the various components such as transformers for example is not easy to find if it can be found at all. Various arcane codes on capacitors still give me problems. In any event, the repair work got done correctly.I next got the “bright idea” that I could build reproductions of old amps. That actually went pretty well for low wattage amps without effects such as reverb. When I decided to try to build more complex higher wattage amp things did not go so well.
The main issue in the higher wattage amps was the problems of hum and hiss. This was due to my lack of experience and understanding of the realities of proper lay out and of powers supplies. Hum and hiss in guitar amps is a common problem that even the well-known commercial manufactures often don’t get right.Building amps on turret boards is not common in today’s world except for a few “reissue” amps from the major manufactures. Turret board construction appears to be done mostly by hobbyist and a few small boutique commercial builders. I have yet to find much information on the best ways to lay out turret boards and examples of well thought out grounding schemes. It also appears that design software commonly used to assist in designing digital electronics is not well suited to the development of vacuum tube amps. There appears to be a large amount misinformation being kicked around on the internet. Sorting out fact from fiction has been a perplexing issue for me. Of course, this is just my limited understanding of the subject and very well may be in error.This whole adventure has been both entertaining and frustrating at the same time. I have taken on several other hard to do things in the past, such as becoming a commercial pilot. I never had one moment in those endeavors where I thought I could not learn to do it. Well...in my youth I was bulletproof like most young guys are...lol
I am not so sure about this electronics hobby!Cheers,Billy
When I decide to take up electronics repair of vacuum tube amplifiers as a hobby I had little idea of what I would need to learn. There were many ups and downs in the process. None the less, within a relative short period of time I found I was able to repair amps. Some were pretty easy and others were a bit perplexing.
I got a lot of help here on the Physics Forum,so thanks to everyone.
I assumed that these devices were not too very complex. Although the circuits are not difficult to understand, this old technology is anything but simple. Detailed Information concerning the various components such as transformers for example is not easy to find if it can be found at all. Various arcane codes on capacitors still give me problems. In any event, the repair work got done correctly.I next got the “bright idea” that I could build reproductions of old amps. That actually went pretty well for low wattage amps without effects such as reverb. When I decided to try to build more complex higher wattage amp things did not go so well.
The main issue in the higher wattage amps was the problems of hum and hiss. This was due to my lack of experience and understanding of the realities of proper lay out and of powers supplies. Hum and hiss in guitar amps is a common problem that even the well-known commercial manufactures often don’t get right.Building amps on turret boards is not common in today’s world except for a few “reissue” amps from the major manufactures. Turret board construction appears to be done mostly by hobbyist and a few small boutique commercial builders. I have yet to find much information on the best ways to lay out turret boards and examples of well thought out grounding schemes. It also appears that design software commonly used to assist in designing digital electronics is not well suited to the development of vacuum tube amps. There appears to be a large amount misinformation being kicked around on the internet. Sorting out fact from fiction has been a perplexing issue for me. Of course, this is just my limited understanding of the subject and very well may be in error.This whole adventure has been both entertaining and frustrating at the same time. I have taken on several other hard to do things in the past, such as becoming a commercial pilot. I never had one moment in those endeavors where I thought I could not learn to do it. Well...in my youth I was bulletproof like most young guys are...lol
I am not so sure about this electronics hobby!Cheers,Billy