carbon films are more stable than carbon composition types imho. to address the inductance isssue, i will parallel two or more, i.e. to get a 40kohm plate load resistor, i am going to wire 3 120K 2 watt resistors in parallel. film resistors are dirt cheap in our country.
Johan Potgieter said:
the McIntosh MC-275 had its traffos close to one another, i guess since they were in metallic cans, then all worked out fine.
arnoldc said:
Nah, I know your DMM works ok, I just can't believe the ABs to drift like that. And thanks for reminding me. 🙂
I'm lost now... you mean Carbon Film resistor is different from a Carbon composition resistor?
What types are those commonly bought from Raon?
Thanks
JojoD
Dominique_free said:
Dont you meant he 4 box option. BTW my signal sources are all high level (iPod, CD player etc..).
Johan Potgieter said:
My OPTs are EI core. C core were twice as expensive. My PS is a Torroid. Does this make a difference.
arnoldc said:
1. I am looking at bus grouding as I think star groundign will be asking for too many wirs to run near each other.
2. How did you manage with no hookup wire.
3. This layout is a prototype.
4. The PS has been ordered with a faraday shield.
JojoD818 said:
I'm gonna pray and hope that it they are. If not the 4 box option (mentioned above) might be a way out.
carbon composition resistors were common in raon until about the 70's when carbon films started to appear. but every now and then i see some carbon composistion resistors being sold at DEECO.
Tony said:
I did think about that but I feared that the EMI would get worse. Vertical the amp would fit ina 12" square box instead of teh present 12x14 box.
jojod, resistors - http://www.epanorama.net/links/componentinfo.html#resistor 😀
navin, i should have said, minimal hookup wire. i'll show you one of my crappy wiring in a picture 😀
navin, i should have said, minimal hookup wire. i'll show you one of my crappy wiring in a picture 😀
Tony said:
so nowadays carbon films are more and more common. i am seriously considering using the more commonly available resistors since I already have some, that way I only have to buy what I need.
thanks
you have seen my amp, the trannies are kinda close to each other but thankfully no noise problems occured.
arnoldc said:
I tried to read the link but.... my eyes went
😀
but this caught my attention
# Metal oxide resistor: mostly similar features as metal film resistor but better surge handling capcity, higer temperature rating them metal film resistor, low voltage dependity, low noise, better for RF than wire wound resistor but usually worse temperature stability
I have these too in my armory, any unfortunate experience with metal oxides?
kiwame resistors can be obtained from discarded pc monitor boards, you have to get many of them to choose the values you need.
there is a place near SM Centerpoint in Sta Mesa, where they sell discarded boards on a per kilo basis, it is there that i get my nichicon 105*C electros any polyproplylene caps from boards.
i use them for my projects all the time.
there is a place near SM Centerpoint in Sta Mesa, where they sell discarded boards on a per kilo basis, it is there that i get my nichicon 105*C electros any polyproplylene caps from boards.
i use them for my projects all the time.
Inspiration or nightmare? 😀
Hi Navin, this is how I wire my stuff. You will see that the only wires are from the filament transformer itself, from the shielded input from RCA, and power line.
Hi Navin, this is how I wire my stuff. You will see that the only wires are from the filament transformer itself, from the shielded input from RCA, and power line.
An externally hosted image should be here but it was not working when we last tested it.
I also like Kiwame resistors, unfortunately they're only available abroad. I wish that we'll have a local distributor.
the quality of film caps to be found inside of discarded monitors are first rate, specialy around the hosizontal/vertical scan sections, you can find polyprops there. even elctros are rated 105*C types.
JojoD818 said:
Yes but you know more than me. So I am more likely to mess up.
arnoldc said:
Yikes that looks tight. Is that recommended. I have seen amp where the wires are longer so that the components are further apart.
Not true, I mess up a lot of times too but the guys here are always willing to help, so I am not too afraid of messing up anymore. 😉
As for point-to-point, I think that as close as possible is better so you minimize the signal's path. I don't know if this much would matter but it saves space and a lot of hook-up wires.
The basic thing I remember is to follow the minimum distance between any two tubes so that the air through natural convection can cool down the tube naturally. With such a small distance, hook-up wires won't be necessary since caps and resistors have long leads.
As for point-to-point, I think that as close as possible is better so you minimize the signal's path. I don't know if this much would matter but it saves space and a lot of hook-up wires.
The basic thing I remember is to follow the minimum distance between any two tubes so that the air through natural convection can cool down the tube naturally. With such a small distance, hook-up wires won't be necessary since caps and resistors have long leads.
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