peavey 5150/6505/6505+ HT - diyAudio
Go Back   Home > Forums > Live Sound > Instruments and Amps

Instruments and Amps Everything that makes music, Especially including instrument amps.

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
Reply
 
Thread Tools Search this Thread
Old 8th October 2011, 11:57 AM   #1
diyAudio Member
 
Join Date: Nov 2010
Location: England Hertfordshire
Default peavey 5150/6505/6505+ HT

Hello there,

I dont suppose anyone knows the HT voltages a=in a peavey the stated peavey amps? it would be helpful and much appreciated if you could give a HT for each stage (preamp 1, 2, 3, 6l6g2, 6l6a). ive checked schematics and they dont say alot. and i dont know anyone with one that would let me check.

Thanks
  Reply With Quote
Old 8th October 2011, 01:25 PM   #2
diyAudio Member
 
Join Date: Jul 2005
Location: North Derbyshire
Do you have a faulty one?, if so what's the problem? - the most common problem with valve amps are the anode loads of the triodes going high.
__________________
Nigel Goodwin
  Reply With Quote
Old 8th October 2011, 05:12 PM   #3
diyAudio Member
 
indianajo's Avatar
 
Join Date: Jan 2010
Location: Jeffersonville, Indiana USA
You can look at the tube datasheets on triodeelectronics.com for max plate voltage (anode). Then make sure yours are less. Usually amps with tube input and drivers have uniformly increasing plate voltage from the input tubes to the output. The usual scenario is for the HV cap to get leaky somewhere about 20 years, and the big resistors drop too much. More rarely, a tube gets gassy or the bias voltage gets off, and the high voltage supply is okay, but the plate resistor drops too much.
__________________
Dynakit ST70, ST120, PAS2,Hammond H182(2 ea),H112,A100,10-82TC,Peavey CS800S,1.3K, SP2-XT's, T-300 HF Proj's, Steinway console, Herald RA88a mixer, Wurlitzer 4500, 4300

Last edited by indianajo; 8th October 2011 at 05:17 PM.
  Reply With Quote
Old 8th October 2011, 08:31 PM   #4
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
It is a commercial amp of which they have made thousands and thousands. The voltages won;t be too high for the tubes.

Typical Peavey 6L6 100 watt amp voltages will be like most similar amps. SOmething in the 480-500v range would be common on the plate node. Screens would be a few volts less, and the preamp nodes somewhere in the 300-350 range I'd expect.

A rule of thumb is about a milliamp or so for each 12AX7 triode. Calculate the3 total current through a B+ node and you will have an idea of the voltage dropped across the node resistor.

My shop has been an authorized repair shop for Peavey and fender and many others for 25 years or so, and I don't recall really needing a voltage chart. If a preamp triode is not conducting, the plate voltage will swing up to the supply voltage - Ohm's Law. Otherwise, the plate ought to be somewhere in the middle compared to the B+ there. SO if the plate voltage is really high, it usually just means the tube is not working or the cathode leg is open.
  Reply With Quote
Old 9th October 2011, 11:36 AM   #5
diyAudio Member
 
Join Date: Nov 2010
Location: England Hertfordshire
i dont have one for it to be faulty! i wanted to build a preamp similar, but i wanted a rough idea of what the HT voltages would be. i know the main bulk of the preamp is the same as an SLO, but its the extra stages on the end of it that interest me, (also completely unrelated to the problem, i felt like haveing a go at building it point to point on tagstrip in a small of a space as possible )
  Reply With Quote
Old 9th October 2011, 01:05 PM   #6
diyAudio Member
 
Join Date: Jul 2005
Location: North Derbyshire
Quote:
Originally Posted by razorrick1293 View Post
i dont have one for it to be faulty! i wanted to build a preamp similar, but i wanted a rough idea of what the HT voltages would be. i know the main bulk of the preamp is the same as an SLO, but its the extra stages on the end of it that interest me, (also completely unrelated to the problem, i felt like haveing a go at building it point to point on tagstrip in a small of a space as possible )
Look for 200-250V feeding the preamp, the actual anode voltages will be much less due to the voltage drop across the load resistors.
__________________
Nigel Goodwin
  Reply With Quote
Old 9th October 2011, 01:25 PM   #7
diyAudio Member
 
Join Date: Nov 2010
Location: England Hertfordshire
Quote:
Originally Posted by Nigel Goodwin View Post
Look for 200-250V feeding the preamp, the actual anode voltages will be much less due to the voltage drop across the load resistors.
really? isnt that a bit low? i expected more, but if thats the case thats perfect!
  Reply With Quote
Old 9th October 2011, 04:57 PM   #8
diyAudio Member
 
Join Date: Jul 2005
Location: North Derbyshire
Quote:
Originally Posted by razorrick1293 View Post
really? isnt that a bit low? i expected more, but if thats the case thats perfect!
That's all you need for the preamps and many amps probably run lower than that, anode voltages tend to by 60V - 150V or so.

Have alook at this Marshall example:

http://www.drtube.com/schematics/marshall/2204u.gif

It's really VERY, VERY non-critical.
__________________
Nigel Goodwin
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
help with peavey 5150 bias adjustment YonjaminYodle Instruments and Amps 7 9th March 2012 06:17 PM
Panasonic rx 5150 multisync Everything Else 0 20th January 2010 01:16 AM
5150 or slo 5-50w clone spaceball11 Tubes / Valves 0 2nd November 2009 03:50 PM
Sony ST 5150 tuner SM Praudio Parts 0 3rd January 2008 04:03 PM
peavey 5150 combo dogomias Instruments and Amps 10 25th May 2007 08:47 AM


New To Site? Need Help?

All times are GMT. The time now is 09:53 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2