Are genuine bias pots available OR120

Orange Amps Technical Q&A's

Moderator: bclaire

Post Reply
LD50
Tiny Terror
Posts: 59
Joined: Thu May 19, 2016 8:35 pm

Are genuine bias pots available OR120

Post by LD50 » Sat Jun 16, 2018 2:56 pm

I have a couple of mid 70s OR120s, one is in need of lots of TLC and I need a new bias pot (and ideally heater balance pot) of the original type with plastic cover and correct rating to fit on the board (Labelled Orange OR80/120 Mk ii).
The 100R heater balance pot is presumably 10-15v rated and several amps. The bias pot will need to be 100v rated but only 200mA rated?
Does anyone know of a source for these?
Many thanks in advance.

bclaire
Forum Moderator
Posts: 17469
Joined: Thu May 02, 2002 9:19 pm
Location: Outside Boston MA, USA
Contact:

Re: Are genuine bias pots available OR120

Post by bclaire » Sat Jun 16, 2018 3:48 pm

An amp tech could source them for you in a few minutes.

Gladmarr
Orange Master
Posts: 1579
Joined: Tue Dec 31, 2002 4:58 am
Location: Feenix, AZ, USA
Contact:

Re: Are genuine bias pots available OR120

Post by Gladmarr » Sat Jun 16, 2018 4:42 pm

IF the same style is still available, it would be a matter of searching far and wide for them. You’d have to see if you can see any company-identifying markers on them. I really doubt you’re going to find the EXACTLY correct pots, but I do know the ones used in the 90s reissue amps are still available.

fiveightandten
Orange Master
Posts: 3840
Joined: Sat Apr 05, 2003 6:18 pm
Location: Connecticut, USA

Re: Are genuine bias pots available OR120

Post by fiveightandten » Sun Jun 17, 2018 4:42 pm

Your best bet is to measure the lead spacing and search around on www.mouser.com for something that is correct spec and fits. It is likely a tall order to fill.

-Nick
Image
'71 GRO100 || '96 OR-80 || AD30 || '64 AC-50 || AC-30TBX || Hiwatt DR504 || HI-TONE HT30
LP Standard || LP Studio || LP Custom Lite || Ric 620 || Ric 360 || MIA Tele || SG 61 RI

LD50
Tiny Terror
Posts: 59
Joined: Thu May 19, 2016 8:35 pm

Re: Are genuine bias pots available OR120

Post by LD50 » Mon Jun 18, 2018 11:42 am

Thanks Billy - but, as the other gentlemen with an interest in vintage Oranges these things are no longer stock items and, as I suspected from my general enquiries, seem be pretty hard to source.

I have replacement ones with correct spacing to hand (old style wafer with metal slot, but was after the correct original type if they are still available from some obscure store!

The 90s reissue ones might be the nearest thing?

LD50
Tiny Terror
Posts: 59
Joined: Thu May 19, 2016 8:35 pm

Re: Are genuine bias pots available OR120

Post by LD50 » Mon Jul 23, 2018 2:15 pm

Good news.

I found some.

An e-bay seller: hmss

Listing number: 232841513742

He ahs both 100R and 100k and other values. These are the correct RS pots. You will see on listing there are two types, the common lug has a thread for a nut, the other type (the ones I need) are just hollow solder lug. Obviously NOS and the lugs needed a polish but exactly as the originals.

LD50
Tiny Terror
Posts: 59
Joined: Thu May 19, 2016 8:35 pm

Re: Are genuine bias pots available OR120 - yes!

Post by LD50 » Mon Jul 23, 2018 2:16 pm

LD50 wrote:
Sat Jun 16, 2018 2:56 pm
I have a couple of mid 70s OR120s, one is in need of lots of TLC and I need a new bias pot (and ideally heater balance pot) of the original type with plastic cover and correct rating to fit on the board (Labelled Orange OR80/120 Mk ii).
The 100R heater balance pot is presumably 10-15v rated and several amps. The bias pot will need to be 100v rated but only 200mA rated?
Does anyone know of a source for these?
Many thanks in advance.

Gladmarr
Orange Master
Posts: 1579
Joined: Tue Dec 31, 2002 4:58 am
Location: Feenix, AZ, USA
Contact:

Re: Are genuine bias pots available OR120

Post by Gladmarr » Tue Jul 24, 2018 12:07 am

LD50 wrote:
Mon Jul 23, 2018 2:15 pm
Good news.

I found some.

An e-bay seller: hmss

Listing number: 232841513742

He ahs both 100R and 100k and other values. These are the correct RS pots. You will see on listing there are two types, the common lug has a thread for a nut, the other type (the ones I need) are just hollow solder lug. Obviously NOS and the lugs needed a polish but exactly as the originals.
Excellent news! 8)


(Except on further investigation, I can’t find that auction/item number OR that seller’s ID anywhere)

LD50
Tiny Terror
Posts: 59
Joined: Thu May 19, 2016 8:35 pm

Re: Are genuine bias pots available OR120

Post by LD50 » Tue Jul 24, 2018 9:33 pm


LD50
Tiny Terror
Posts: 59
Joined: Thu May 19, 2016 8:35 pm

Re: Are genuine bias pots available OR120

Post by LD50 » Tue Jul 24, 2018 9:45 pm

LD50 wrote:
Tue Jul 24, 2018 9:33 pm
Sorry hmhss is the seller

https://www.ebay.co.uk/itm/Potentiomete ... 1438.l2649
Image

Gladmarr
Orange Master
Posts: 1579
Joined: Tue Dec 31, 2002 4:58 am
Location: Feenix, AZ, USA
Contact:

Re: Are genuine bias pots available OR120

Post by Gladmarr » Thu Jul 26, 2018 4:16 am

Right on!! How did you find these? I never have the patience to find this kind of obscure stuff on eBay.

jontheid
Orange Expert
Posts: 812
Joined: Sun Nov 02, 2008 1:05 pm
Location: London, UK

Re: Are genuine bias pots available OR120

Post by jontheid » Wed Oct 17, 2018 1:42 pm

Just bought 2 x bias pots and 2 x hum pots. Turns out the seller lives about a mile away from me! Lots of other interesting stuff for sale too.

LD50
Tiny Terror
Posts: 59
Joined: Thu May 19, 2016 8:35 pm

Re: Are genuine bias pots available OR120

Post by LD50 » Sun Oct 21, 2018 3:59 pm

Lots of other interesting stuff - do tell!

Post Reply

Who is online

Users browsing this forum: No registered users and 2 guests