Kent SL 21 Tube head need help!! - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 20th January 2012, 06:23 PM   #1
diyAudio Member
 
Join Date: Dec 2011
Default Kent SL 21 Tube head need help!!

So I just bought a Kent SL 21 amp head on eBay and realized I have no clue what the output of the amp is in ohms so I can wire my speaker cabinet properly. Here is the best picture of the schematics I can come up with. I haven't been able to find anything about these amps online but its a 2 - EL84, 2-12ax7, what appears to be a 6v4 rectifier amp. Not sure on wattage either so if anyone can help me out with that one I would appreciate it. It is missing its fuse and from what I gathered from my little knowledge of tube amps and stuff is that I need a 3AG 2 Amp Fast blowing fuse? Not sure if that's right either. Really any info anyone might have on helping me out would be great thanks.

If the photo link doesn't work I can email it. Not great at this whole forum thing lol.

Click the image to open in full size.

kent amp schematics | Flickr - Photo Sharing!
  Reply With Quote
Old 20th January 2012, 10:39 PM   #2
Jebem is offline Jebem  Portugal
diyAudio Member
 
Jebem's Avatar
 
Join Date: Dec 2011
Location: Lisbon
I don't know that amp in particular, however from a pair of EL84 in Push-Pull we can expect a minimum of 5 Watt in Class A and a maximum of 15 Watt in Class B. It really depends on the BIAS operating point used for the output tubes.

You can connect a 8 ohm impedance loudspeaker to that amplifier, as this is the standard value to be used when we don't have any other clue.

As for the fuse, it depends on the mains supply the amplifier is designed to operate with (110V or 220V). But I would say that an 1 Amp slow blow fuse or a 2 Amp fast blow are acceptable values, as this is a low power amplifier.
__________________
If You need something done properly, do it yourself (and ask help from DIYaudio... )
One of my SE 211 tube amps: http://sites.google.com/site/sunajeb...ificador-211se
  Reply With Quote
Old 20th January 2012, 11:02 PM   #3
diyAudio Member
 
Join Date: Dec 2011
Thanks. I ended up putting the 2 A fb fuse in it and hooking up my 8 ohm speaker and it sounds alright. Really quiet though. The pots are gonna have to be changed because they all are really rough. All the tubes light up. At first it had a lot of crackle and pop and then it just came alive. Probably the first time its had power in a long while. Its really quiet and kind of muddy so I am thinking maybe a bad cap or two. So I think I am either going to take it to a local music store to have a cap job and see if that helps or try and convince one of my friends who knows about electronics to help me with it. Need to change out the 2 prong cord first and then check everything. But hey it works. It has tremolo on one of the channels, but I think it requires a footswitch to work, because I couldn't get anything out of it with just the knobs. I'll post some pictures here tomorrow hopefully. This is a unique little amp from what I can gather. I have found only one picture of a combo version of it online and it didn't have much on it. No info pages anywhere. Hopefully I can get it back up and running in full working order. If I can get it sounding good then I am probably going to build a cabinet for it and possibly a new speaker cabinet as well. Its in kinda rough shape the way it is now. Thanks again for your help.
  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
Peavy windsor tube head issue rockster363 Tubes / Valves 5 21st September 2010 05:42 AM
Greetings from Kent, England Simon Introductions 2 8th July 2010 02:43 PM
FS Firstone tube head preamp hamish_gill Swap Meet 0 11th April 2009 03:39 PM
Ultimate Tube head phone amp. tube-lover Tubes / Valves 14 13th July 2005 04:25 PM
tube rolling Blue Circle BC 21 preamp sunseeker Tubes / Valves 0 27th February 2005 02:41 PM


New To Site? Need Help?

All times are GMT. The time now is 10:27 AM.


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