Grid Resistors for ODS V2
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- ValvElectric
 - Posts: 41
 - Joined: Sat Apr 04, 2015 5:11 am
 - Location: Santa Cruz, CA
 
Grid Resistors for ODS V2
Hey guys, 
I can't for the life of me find a reasonable source for the 68k & 180k 2W carbon film resistors found on the V2 grids of most Overdrive Specials. I know HAD used NOS Iskras and Pihers but the few sources I've found with these values are asking a small fortune, and it seems these values are only available by special order on Mouser.
So what are you guys using?
			
			
									
									
						I can't for the life of me find a reasonable source for the 68k & 180k 2W carbon film resistors found on the V2 grids of most Overdrive Specials. I know HAD used NOS Iskras and Pihers but the few sources I've found with these values are asking a small fortune, and it seems these values are only available by special order on Mouser.
So what are you guys using?
Re: Grid Resistors for ODS V2
Dumble seldom used 2w resistors on the grids.ValvElectric wrote:Hey guys,
I can't for the life of me find a reasonable source for the 68k & 180k 2W carbon film resistors found on the V2 grids of most Overdrive Specials. I know HAD used NOS Iskras and Pihers but the few sources I've found with these values are asking a small fortune, and it seems these values are only available by special order on Mouser.
So what are you guys using?
He used Piher 1/2w or 1w NTE Flameproof 1/2w HW, Dale wirewound on V1a input grid on some later amps, Sprague Q line relabeled iskras, piher, beyschlag
- 
				hitchcaster
 - Posts: 296
 - Joined: Thu Jun 01, 2006 12:30 am
 
Re: Grid Resistors for ODS V2
I like the NOS best... just go on eBay a and grab a few 
			
			
									
									
						- ValvElectric
 - Posts: 41
 - Joined: Sat Apr 04, 2015 5:11 am
 - Location: Santa Cruz, CA
 
Re: Grid Resistors for ODS V2
You're right. 
My memory was momentarily clouded by a #102 layout that insisted the grids be 2w CF's.
I too am a fan of NOS but I find myself usually having to order internationally to get them for less than $5 a piece.
			
			
									
									
						My memory was momentarily clouded by a #102 layout that insisted the grids be 2w CF's.
I too am a fan of NOS but I find myself usually having to order internationally to get them for less than $5 a piece.
- David Root
 - Posts: 3540
 - Joined: Fri Aug 04, 2006 3:00 pm
 - Location: Chilliwack BC
 
Re: Grid Resistors for ODS V2
Try to find NOS Draloric or Resista from the same period as the earlier Pihers ie  late '60s into the '70s. I got some a while ago and they were much cheaper than the Pihers, and they are quality Made in Germany product. 
I don't believe HAD used either but they were in their day competitive with Piher and highly regarded by audio manufacturers at the time. I've used them myself although not yet 100% in a build. Waiting until Pihers become unobtainium, which won't be long I think.
Now even the '90s Pihers are getting pricey (they are slightly smaller than the earlier ones). The old Dralorics are slightly bigger than the old Pihers, the Resistas shorter but noticeably fatter. The Dralorics are beige and the Resistas are dark brownish purple.
All comments are relative to 1/2W resistors.
			
			
									
									
						I don't believe HAD used either but they were in their day competitive with Piher and highly regarded by audio manufacturers at the time. I've used them myself although not yet 100% in a build. Waiting until Pihers become unobtainium, which won't be long I think.
Now even the '90s Pihers are getting pricey (they are slightly smaller than the earlier ones). The old Dralorics are slightly bigger than the old Pihers, the Resistas shorter but noticeably fatter. The Dralorics are beige and the Resistas are dark brownish purple.
All comments are relative to 1/2W resistors.
Re: Grid Resistors for ODS V2
I have never seen a Dumble with Iskras. The tan carbon films you see in later amps were .7W Draloric ( Sprague rebranded as Q lines) used in the signal path or ocassionally a 1W, normally 1W used in the PS rail and on the pre-amp plates, 2W used on the cap balancing resistors and the bleeder resistor in the MusicMan plate voltage scheme.
TM
			
			
													TM
					Last edited by ToneMerc on Wed May 13, 2015 1:48 pm, edited 2 times in total.
									
			
									
						Re: Grid Resistors for ODS V2
I don't ever recall seeing an inductive wirewound at V1a in later amps. What folks think is wirewound, is actually a CGW glass passivated thick film resistor.Duble wrote:
Dale wirewound on V1a input grid on some later amps
TM
Re: Grid Resistors for ODS V2
I have a pretty decent supply of vintage CF resistors, but if I had to choose an easily obtainable 1/2W CF across all values from Mouser, it would be the KOA Speer CF1/2 series.ValvElectric wrote:
So what are you guys using?
However, if you are hung up on "the look", one might not like the smaller size as the body is only around 7mm in length.
TM
Re: Grid Resistors for ODS V2
Can you point me towards these I can't find the CF type only MF?ToneMerc wrote:
I have a pretty decent supply of vintage CF resistors, but if I had to choose an easily obtainable 1/2W CF across all values from Mouser, it would be the KOA Speer CF1/2 series.
However, if you are hung up on "the look", one might not like the smaller size as the body is only around 7mm in length.
TM
Cheers
Re: Grid Resistors for ODS V2
lovetone wrote:Can you point me towards these I can't find the CF type only MF?ToneMerc wrote:
I have a pretty decent supply of vintage CF resistors, but if I had to choose an easily obtainable 1/2W CF across all values from Mouser, it would be the KOA Speer CF1/2 series.
However, if you are hung up on "the look", one might not like the smaller size as the body is only around 7mm in length.
TM
Cheers
http://www.mouser.com/ProductDetail/KOA ... 8%252bk%3d
Re: Grid Resistors for ODS V2
My mistake, after quick observation, you're most certainly correct.ToneMerc wrote:I don't ever recall seeing an inductive wirewound at V1a in later amps. What folks think is wirewound, is actually a CGW glass passivated thick film resistor.Duble wrote:
Dale wirewound on V1a input grid on some later amps
TM