Ceramic Resistor Max Temps? - Page 2

PRR · 10th July 2005, 01:37 AM

> 108ma is believable. there is a tube pre amp, 2 4 section parametric EQs, the crossover, master bass/treble controls, the direct/line out stage and the master control section. quite a bit of stuff in the front end

Well, the tubes either don't eat the +/-15V, or they pass fractional-mA current at such low voltage. 108mA is not enough to light heaters, so I assume they get fed some other way?

Two 4-section para-EQs could be 40 opamps, though space and economics suggest less.

Crossover, say 6 opamps.

Bass/treb controls are often one opamp, but say 2.

Say another 10 for master and output buffers.

40+6+2+10= say 60 opamps. As 15 quad-amp chips, it must look like a 1976 computer inside.

TL072 opamps are popular in instrument amps, eat 1.5mA each, 90mA. Yeah, you are around 100mA IF my SWAG chip-count is right.

Does it really have a dozen 14-pin or two dozen 8-pin chips inside?

You say tube. What powers its heater? Is there any chance of tapping that to make chip-power?

Or hiding a 22VCT 300mA transformer somewhere?

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
Little help with ceramic cap ID?	peace brainerd	Parts	1	4th December 2008 09:36 PM
SMD ceramic cap. Which one?	antomas	Parts	3	12th September 2006 01:05 PM
Query about torroid temps	ShinOBIWAN	Solid State	26	27th April 2005 11:26 PM
screen-plate resistor and grid leak resistor	metebalci	Tubes / Valves	4	26th February 2004 04:18 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

10th July 2005, 01:37 AM	#11
PRR diyAudio Member Join Date: Jun 2003 Location: USA	> 108ma is believable. there is a tube pre amp, 2 4 section parametric EQs, the crossover, master bass/treble controls, the direct/line out stage and the master control section. quite a bit of stuff in the front end Well, the tubes either don't eat the +/-15V, or they pass fractional-mA current at such low voltage. 108mA is not enough to light heaters, so I assume they get fed some other way? Two 4-section para-EQs could be 40 opamps, though space and economics suggest less. Crossover, say 6 opamps. Bass/treb controls are often one opamp, but say 2. Say another 10 for master and output buffers. 40+6+2+10= say 60 opamps. As 15 quad-amp chips, it must look like a 1976 computer inside. TL072 opamps are popular in instrument amps, eat 1.5mA each, 90mA. Yeah, you are around 100mA IF my SWAG chip-count is right. Does it really have a dozen 14-pin or two dozen 8-pin chips inside? You say tube. What powers its heater? Is there any chance of tapping that to make chip-power? Or hiding a 22VCT 300mA transformer somewhere?

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