6CK4 PP Amp
 User Name Stay logged in? Password
 Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read Search

 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
 15th March 2003, 12:27 AM #1 Jack Thomas   diyAudio Member   Join Date: Jul 2002 Location: Baltimore, Maryland, USA 6CK4 PP Amp I'm looking for some help in building a PP amp using the 6CK4. If someone has any hints or info, I would certainly appreciate some guidance what kind of load line, etc. Tks, Jack T.
 15th March 2003, 02:01 AM #2 Sch3mat1c   diyAudio Member     Join Date: Jan 2003 Location: Milwaukee, WI Hmm...neat tube , I want some!! Sorta like 6W6 I guess... anywho... For class A1: maybe 200V supply, 50mA bias (-20V grid, 400 ohms per tube if cathode bias) = 10W dissipation (I'm sure you could push 15W Pd, vertical deflection is tough so it's going to be a hearty tube). Loadline. Go up to the zero-bias curve and choose a point.. approx. double current (i.e. 100mA) is typical. That seems a little shallow so I'll say 125mA, which happens at 100V. The flipside of the point occurs at -40V, twice the bias voltage, about 5mA/255V. Thus Imax and Imin are 124 and 5mA respectively; Io (operating) is 50mA; Vmax is 257, Vo is 200, and Vmin is 100V. The slope of the loadline is the resistance, (Vmax-Vmin)/(Imax-Imin), or about 1.3k. You can also calculate distortion, based on: Code: ``` Imax + Imin ------------- - Io 2 2nd H % = -------------------- * 100 Imax - Imin``` Which can be simplified (algebraically speaking ) to: Code: `2nd H % = 50(Imax^2 - Imin^2) + 100Io(Imin - Imax)` (That assumes my logic unit is still working.. it tends to get faulty with sleepiness... ) Anyway. That comes to 12%, but I just remembered that 2nd H is canceled in PP amps so you can ignore it Have fun. Wonder how many responses popped in while I typed this...(when I started there were none )... Tim
Sch3mat1c
diyAudio Member

Join Date: Jan 2003
Location: Milwaukee, WI
Forgot the graph I prepared..

The loadline shown is SE. For PP, each tube needs to see that - so 1.3k per half (either side of the CT). So the anode-to-anode load must be four times, or 5.2k (you needn't be so exact, a 4 or 6k would work about the same ).

Now, this is where I keep forgetting things... Do the tubes act in series, hence a-a = 4*single Rl? Or do they act in parallel, giving a-a nearer 1x? Or somewhere inbetween, say one tube is half cutoff (half Gm or Rp, take your pick) and the load is suddenly on a single tube!

Tim
Attached Images
 6ck6.gif (18.8 KB, 368 views)

 15th March 2003, 02:23 AM #4 Ryder diyAudio Member   Join Date: Feb 2002 Location: Michigan how about a schematic? Scroll down this page for one idea. http://hollowstate.netfirms.com/DIY_files/proto.htm here is another http://tinpan.fortunecity.com/saints...er/6ck4-pp.gif http://tinpan.fortunecity.com/saints...mer/index.html Something to start with anyway. Cheers Craig Ryder __________________ Ryder Any fool can ask more questions than seven sages can answer.
 15th March 2003, 03:09 AM #5 Sch3mat1c   diyAudio Member     Join Date: Jan 2003 Location: Milwaukee, WI I don't recommend the second one.. 100uF on a 5U4 is liable to pop it, hearty though the tube is! That guy was probably going from his junk pile, but if you must do it like that, use a lower voltage transformer or choke input. Tim
 15th March 2003, 04:00 AM #6 Jack Thomas   diyAudio Member   Join Date: Jul 2002 Location: Baltimore, Maryland, USA 6CK4 PP Amp So many with so much information, so quickly. Do you guys have lives? What more could I ask for? Thanks so very much. I'll put pencil to tongue and go from there! Tks a mil, Jack T.
Sch3mat1c
diyAudio Member

Join Date: Jan 2003
Location: Milwaukee, WI
Re: 6CK4 PP Amp

Quote:
 Originally posted by Jack Thomas So many with so much information, so quickly. Do you guys have lives?
No..

planet10
frugal-phile(tm)
diyAudio Moderator

Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Quote:
 Originally posted by Sch3mat1c Now, this is where I keep forgetting things... Do the tubes act in series, hence a-a = 4*single Rl? Or do they act in parallel, giving a-a nearer 1x?
I tried to follow a thread on the JoeList on this subject -- seemed like a thousand posts -- and there seemed to be perfectly valid arguments for both cases -- over my head at the moment.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA

fdegrove
diyAudio Senior Member

Join Date: Aug 2002
Location: Belgium
6CK4

Hi,

Quote:
 Do you guys have lives?
We all sold our souls to DIY...no live, no pay...just helping out the newBs....maybe a small statue...if you insist.

Cheers,

/This may be an idea for the "Policies thread"...oh well we'll see ...
__________________
Frank

EC8010
diyAudio Moderator Emeritus

Join Date: Jan 2003
Location: Near London. UK
Statue

Quote:
 Originally posted by fdegrove ...maybe a small statue...if you insist...
What did you have in mind? How about a 1950s communist-style statue of our worker hero striding boldly forward with soldering iron held proudly aloft?
__________________
The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

 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 Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Site     Site Announcements     Forum Problems Amplifiers     Solid State     Pass Labs     Tubes / Valves     Chip Amps     Class D     Power Supplies     Headphone Systems Source & Line     Analogue Source     Analog Line Level     Digital Source     Digital Line Level     PC Based Loudspeakers     Multi-Way     Full Range     Subwoofers     Planars & Exotics Live Sound     PA Systems     Instruments and Amps Design & Build     Parts     Equipment & Tools     Construction Tips     Software Tools General Interest     Car Audio     diyAudio.com Articles     Music     Everything Else Member Areas     Introductions     The Lounge     Clubs & Events     In Memoriam The Moving Image Commercial Sector     Swap Meet     Group Buys     The diyAudio Store     Vendor Forums         Vendor's Bazaar         Sonic Craft         Apex Jr         Audio Sector         Acoustic Fun         Chipamp         DIY HiFi Supply         Elekit         Elektor         Mains Cables R Us         Parts Connexion         Planet 10 hifi         Quanghao Audio Design         Siliconray Online Electronics Store         Tubelab     Manufacturers         AKSA         Audio Poutine         Musicaltech         Holton Precision Audio         CSS         exaDevices         Feastrex         GedLee         Head 'n' HiFi - Walter         Heatsink USA         miniDSP         SITO Audio         Twin Audio         Twisted Pear         Wild Burro Audio

 Similar Threads Thread Thread Starter Forum Replies Last Post Sheldon Tubes / Valves 93 29th December 2005 06:25 PM

 New To Site? Need Help?

All times are GMT. The time now is 04:44 PM.

 Home - Contact Us - Advertise - Rules - diyAudio Store - Sponsors - Privacy Statement - Terms of Service - Top - Opt-out policy

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.79%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.