Cap "C8" on QUAD 405.2 PCB

ClassA · 21st November 2005, 05:16 AM

Hi,
I want to replace the original C8 (ceramic cap) with a new cap for QUAD 405.2 but I do not know the spec of the original C8 (120pF/?V). Is there anyone know about it? I have some philips n12 cap (film cap?) with black or purple color on the top of the caps. Can I use them to replace C8? What is the meaning of the color? Which color should I use? Is it better to use silver mica cap (120pF/100V) to replace C8?

Thanks!

RogerGustavsson · 21st November 2005, 03:22 PM

My 405-2 has a 120 pF at the C8 position. I do not know the type of it. I will have a look this evening.

RogerGustavsson · 21st November 2005, 03:58 PM

I have just been taking a look inside my Quad 405-2. C8 is a 120 pF ceramic disc capacitor, lead spacing is 7.5 mm. The PCB in my Quad 405-2 is 12565 Issue 5.

ClassA · 22nd November 2005, 02:40 PM

Hi Roger,
The C8 on my 405.2 is a ceramic disc cap with purple color on the top and marked 121J (should be 120pF) but I do not know its voltage spec.

RogerGustavsson · 22nd November 2005, 03:44 PM

I would use a close tolerance polypropylene or polystyrene capacitor in that position. Here is an interesting homepage:

http://www.dc-daylight.ltd.uk/Valve-...-405-Mods.html

21st November 2005, 05:16 AM	#1
ClassA diyAudio Member Join Date: Nov 2005 Location: Taiwan	Cap "C8" on QUAD 405.2 PCB Hi, I want to replace the original C8 (ceramic cap) with a new cap for QUAD 405.2 but I do not know the spec of the original C8 (120pF/?V). Is there anyone know about it? I have some philips n12 cap (film cap?) with black or purple color on the top of the caps. Can I use them to replace C8? What is the meaning of the color? Which color should I use? Is it better to use silver mica cap (120pF/100V) to replace C8? Thanks!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
What makes an amplifier "bright", "warm", or "neutral"?	JohnS	Solid State	51	13th December 2009 06:42 PM
Quad 303 issue "HELP"	Gravenstede	Solid State	3	13th March 2008 09:46 AM
do matched pair (or maybe a quad) output tubes "aged" at the same rate?	jarthel	Tubes / Valves	3	9th June 2007 01:05 AM
Some final pics of "Stacks" revisited and "Askew" with stand	Andy G	Multi-Way	2	3rd February 2005 06:07 AM
Design "flaw" in Quad 67CD PSU?	Zombie	Digital Source	3	30th December 2004 10:38 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

21st November 2005, 03:22 PM	#2
RogerGustavsson diyAudio Member Join Date: Aug 2004 Location: Huskvarna	My 405-2 has a 120 pF at the C8 position. I do not know the type of it. I will have a look this evening.

21st November 2005, 03:58 PM	#3
RogerGustavsson diyAudio Member Join Date: Aug 2004 Location: Huskvarna	I have just been taking a look inside my Quad 405-2. C8 is a 120 pF ceramic disc capacitor, lead spacing is 7.5 mm. The PCB in my Quad 405-2 is 12565 Issue 5.

22nd November 2005, 02:40 PM	#4
ClassA diyAudio Member Join Date: Nov 2005 Location: Taiwan	Hi Roger, The C8 on my 405.2 is a ceramic disc cap with purple color on the top and marked 121J (should be 120pF) but I do not know its voltage spec.

22nd November 2005, 03:44 PM	#5
RogerGustavsson diyAudio Member Join Date: Aug 2004 Location: Huskvarna	I would use a close tolerance polypropylene or polystyrene capacitor in that position. Here is an interesting homepage: http://www.dc-daylight.ltd.uk/Valve-...-405-Mods.html

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)