Where Can I Find High Resistance, 2W Resistors?

[TSmith8605]

Hi,
I am rebuilding (repairing) the bias supply for an Acoustat electrostatic speaker and I need at least 1 but preferably 2, 500-Meg, 2W resistors.

I would also like to replace 4, 10-Meg, 2W resistors.

So far, I cannot find a source for these unless I buy 1,000 pieces and wait 8 months and spend a few thousand dollars (per Mouser and Digikey and general Google search).

Are there any sources for these?

I did find some 1-Gig, 7.5 W resistors ($10 each) at a local shop and I guess I could get two and install them in parallel. They will fit.

Sorry if there's already a thread on this - I did search here too and could not find a thread.

Thanks,
Terry, SF Bay Area

 

[rayma]

Don't forget the voltage rating.
You often can buy small sample quantities direct from the mfr or through their sales rep (esp in CA).
** NEW ** High Voltage Axial Resistors (HVA Series) | Ohmcraft
https://riedon.com/media/pdf/HTE.pdf
Caddock's Precision High Voltage Resistors

 

[mirlo]

SM108035006FE Ohmite | Mouser

 

[rayma]

Ten pieces from Onlinecomponents or TTI looks good. These are rated at 15kV.
SM108035006FE Ohmite datasheet and CAD model download | Octopart

 

[Mark Tillotson]

For high voltages its common to use series-strings of resistors as this increases the voltage rating (yes resistors have a maximum voltage rating) as well as total power handling. Its likely to be cheaper than specialist resistors too.

 

[davidsrsb]

A 500 Meg 2W resistor would need to withstand 31 kV to be power limited

 

[Mark Tillotson]

But 1/2W resistors with 5kV rating don't exist!
The size is mainly for the creepage distance. Which is why a series string is advantageous

 

[TSmith8605]

SM108035006FE Ohmite | Mouser

Thank you. I need to work on my Mouser search skills, I guess.

Thanks!

 

[DUG]

When searching, the "size" column can be helpful for HV resistors.

 

[TSmith8605]

I found and installed the parts as suggested above and the speaker is repaired, working and sounding great.

Thanks for the support and suggestions. Much appreciated.

Terry