What resistors are used in 65 amps?

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nzoomed

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#1
I know they are using NOS allen bradley carbon comp, but what about the other 1% mil spec metal film?

They claim they are metal film, but are the same tan colour as most carbon film are.

I dont believe they are NOS, but rather current production high spec resistors.

Either way, i want to get some for a project, ive seen these same resistors in other boutique amps, so they must be fairly well known.

See the photo below, the third component from the left is the type of resistor im after. The 65 SOHO has lots of them inside.

TIA for any info on these 🙂
An externally hosted image should be here but it was not working when we last tested it.
 
#4
djgibson51 said:
http://www.geofex.com/article_folders/carbon_comp/carboncomp.htm

Have you seen this article?
Click to expand...

Yes ive read tons of similar articles, dont get why so many people hate CC.
I take alot of it with a grain of salt anyway. Ive never ever had a noisy amp with them, and ive had lots of really old valve gear ive fired up with them that still sounds good to this very day. Yes they can drift, but...

They are non inductive, and thats why i like them. Some applications require non inductive resistors such as RF gear, and thats why they are still made to this very day.

Whether you can hear any "sound" from them remains to be seen, but ive never had any issues using them in the past.
For Hi-Fi, i would use resistors with high tolerance around 1%, but guitar is not so crucial in most parts of the circuit.

Anyway, im not really interested about the allen bradley carbon comp resistors - ive got tons of them!

The resistors im interested in are supposed to be a high spec metal film resistor, and its this that i want to learn more about.

Has no one ever seen these?
 
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#8
VictoriaGuy said:
Probably not what you are looking for but these have brown-ish bodies:
http://www.vishay.com/docs/28729/pr010203.pdf
Probably too small (the 1W ones I have are the size of most 1/4 watt resistors) and too cheap to impress the boutique crowd, though.

If you go to digikey, they have about 35 000 choices in 1% metal film resistors - enjoy!
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Those resistors do look a good option, they look very similar to the vintage Piher carbon film resistors of the 70's!

Anyway, ill keep those in mind, the ones i see in these amps look like Dale resistors, but with the colour bands instead of printed values.

Im in the middle of reverse engineering a 65 amps SOHO and am going to build my own version with a different output stage using EL34 instead of EL84.

Its alot of work tracing all the wires and drawing a schematic, but will be well worth it for me in the future.

Here is a better image of some ive found elsewhere on the net.
DSCN0318.JPG
 
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#10
vinylkid58 said:
If you're talking about the little brown ones with no stripes, they look like Vishay Dale RN65 series. Digikey list them as CMF series.

jeff
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These do look very similar to the RN65 series, but the fact they have stripes indicates to me that they are a different make or model.

jacco vermeulen said:
Jeff,

use your eyes, they are Dales. There's 4 of them on the right, and they read both brand and value.

(oops, aren't those MF and inductive ?)
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Yes there are dale resistors in that photo, but there are some that are not.
IDK what make they are, but would love to find out.

Yes MF are inductive, although its probably nothing to really worry about.
 
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#12
el84 to el34 is a lot more than a resistor type....you must change driver stage too....btw use dale 1w for input or really high value ,use cc elsewhere, especially on anode ,add some nice H2 distorsion ,use the sozo and take e look on the out, if have the same trick that use Dr.Z on the primary of otp..and send me a copy of course !!!
 
#16
guitar aren't on topic and you will play better if the amp do what you thinks

nzoomet take a look at bias too , my Vox bias is at 140% 4 6v6 russian last only 1year !! min 2H at day, 5 in wk ,300day at year.
Now my 6v6 nos coke marconi are at 80% losing some clean but as I quit with my band is not a problem ...better put switch for bias setting ,I use a nice riken on catode
 
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#19
nzoomed said:
Bump,

Has anyone been able to track these down?
Click to expand...

They look like Vishay/Dale CCF60 resistors to me.

http://www.vishay.com/docs/31068/ccf60.pdf

The image on the datasheet is rubbish, But if you google "Vishay CCF60" you should find plenty of pics of them.

There's better images of them on the RS site;

CCF60100KFKE36 | Vishay CCF60 Series E36 Axial Metal Film Fixed Resistor 100kΩ +-1% 1W +-100ppm/degC | Vishay

Assuming you're in NZ, You're probably best off getting them from Mouser.
 
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