Search results

So I am on ebay looking at wire wound resistors oh my is there ever a lot to dig through........So what do I come across parts out of Taiwan wait for it wait for it...here it come......5W 10Kj that would be 10 kiloJouls........So I actually had a reason to set it up as a conversion factor and...

Ok so the ones that did not have tune and load controls how did they do it? How did they get read of the need for tune and load controls? I would like to try and to build one if I can work out a simple auto tuning circuit. Obviously I do not want to be driving down the road and having to mess...

Well Unit_399 I would say you are foolish because you think you know it all which is the quickest way to look like you know nothing when you think you know it all! I learned that lesson when I was 8 years old. So I would learn to keep ones mind more open to being shocked by what you think you...

old 813 homebrew Amp If you look at this photo you can see the diodes on top of the caps. You will also see two MOT as the power source. This was not the images I saw before I just accidentally found this just now. Another accidental find where we have components stacked on top of...

I just bought 2 GI70B tubes for $14 and $14 to ship to the USA. That is $7 for each tube and $7 to ship each one. So for $28 total I have two 350W-450W tubes headed my way! That will make a grand total of 7 tubes of this model that I own. I would like to have at least 10 total. I plan on...

Alignment link to make sure you have the right pot The Defpom HR 2510 Alignment page It is easy to damage a pot so it could be bad. I always act like I am trying to remove something from a persons eye if it is an iron core pot.

I think it would be smarter to get some MRF 455's they are cheap readily available and that is what the final models of the President Lincoln went to. You can mount some of perf board and do the mod easily. You end up with better inter mod number's, more power if you do the entire mod properly...

I agree people kill a lot of radio's hunting for a few watt's. I have never advocated swapping parts to increase power. I advocate using higher gain lower noise transistors to improve how the radio functions, to make it quieter, to increase head room and to increase gain a bit. Generally if done...

Why in the heck would anyone ever "need" echo!!! Echo is fun at the Grand Cannon but has no place in 2 way radio communication. Their is a reason why phones have never had "echo" built in and why no army, police department, or emergency agency of any kind has ever had "echo" built into a radio...

This might sound like an odd question but why even bother with this if you do not have too??? An SP1-A or something like it would have all the clipping and filtering and gain sorted out so that all you need do is install it and adjust it in under 10 minutes. If you want turn it off when you...

You do understand that you will have less receive signal when talking to anyone mobile or base that has verticle polarity if you have horizontal polarity. If I could not have both horizontal and verticle polarity on a base I would do spiral polarity. This way you are compromised not only for...

I have seen the diodes in the front end blown out and the transistor for the receive blown out before. In fact I even saw a HR2510 that was used freq. in keydown contest's have this happen. Easy to fix... Usually you would install heavy duty Schotcky(sp) Diodes. I have never seen final...

Consider replacing the transistors in the receive section with higher gain lower noise models. Do the front end diode swap for faster switching lower noise and increased sensitivity. Should not be that hard to find a mod for this online for another radio and just apply the same idea to your...

Yes I have been reviewing all online photo's of home brew amps using Russian Mil Surp. tubes. I say 2-3 that had their diodes and resistors directly on top of their cap banks. In all cases these are non-English speakers and a lot of dead links. I tried contacting these guys early on to ask why...

I see some guys put their diodes, resistors and such directly on top of the caps. Some people build it in the form of a board with traces going from the common diode and common resistor banks over to the caps which are also grouped together. SO is their a best practice or does it not matter...

Nothing smaller then 4x 2SC2789 6 or 8 of them would be even better. WIth that sad a 4 transistor amp isnot going to survive 100 watt's drive unless the input has been swamped. I am pretty sure Fatboy is not swamping their input stage at all so you would still need to turn down that radio. A...

Well if it is wireless they would use the argument about being able to recieve any signals broadcast into the air.....Never mind their are still States that forbid radar detectors and do not honor the above argument. In California for a while GM had given police the ability to shut down...

I am big strong guy in H.S. I benched 425lbs. in a powerlifting tournament and used to power cleans with 315lbs. for sets of 10 during football season!! Keep in mind I am very out of shape now but still a big muscular man. That soldering gun had my hand I coordination gone due to the weight...If...

One of the jobs that made me decide to not work as a commercial pilot was flying charter for a company that had a contract with UPS. I had to take off in zero zero weather as in the optical sensor can not see the darn lazer beam being fired at it because the fog is too thick.......Nothing like...

I am also using Russian tubes and before I bought any I already knew I would need to slowly buy not just what I needed today but what I thought I would need tomorrow. On top of that anyone that can build an amp with Russian tubes today can always recycle the amp's parts and install different...