KT66SE

ask your general tube related questions here

Re: KT66SE

Postby 6B4G » Sun Oct 06, 2013 1:03 pm

Is this it?
Attachments
kt66 schem.gif
kt66 schem.gif (31.36 KiB) Viewed 4442 times
User avatar
6B4G
KT88
 
Posts: 287
Joined: Sun Jul 06, 2008 1:02 pm
Location: Greece

Re: KT66SE

Postby azazello » Sun Oct 06, 2013 1:06 pm

If You wants decrease +U to 100v, You must change 47 ohm to about 800 ohm/50W =:o and You will have really Oven....
Also grid resistors 12 kohm ....to 1 kohm
Both plates are shorted!
Last edited by azazello on Sun Oct 06, 2013 1:08 pm, edited 1 time in total.
Projects: OTL 6AS7 Gen, Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, headphone ampl. OTL Loftin White 6AS7 RCA....SE E84L&E80CC Siemens&Tel-n.
User avatar
azazello
KT88
 
Posts: 285
Joined: Tue Nov 10, 2009 8:24 am
Location: Bulgaria - EU

Re: KT66SE

Postby 6B4G » Sun Oct 06, 2013 1:07 pm

In the place of the 6l6 I would like to use a EL37 that I have, it should be ok?
User avatar
6B4G
KT88
 
Posts: 287
Joined: Sun Jul 06, 2008 1:02 pm
Location: Greece

Re: KT66SE

Postby 6B4G » Sun Oct 06, 2013 1:09 pm

azazello wrote:If You wants decrease +U to 100v, You must change 47 ohm to about 800 ohm/50W =:o and You will have really Oven....
Also grid resistors 12 kohm ....to 1 kohm
Both plates are shorted!



Well winter is nearly here and petrol is expensive so I can use it as a heater.........LOL
User avatar
6B4G
KT88
 
Posts: 287
Joined: Sun Jul 06, 2008 1:02 pm
Location: Greece

Re: KT66SE

Postby 6B4G » Sun Oct 06, 2013 1:13 pm

OK like this ?
Attachments
kt66 schem.gif
kt66 schem.gif (31.76 KiB) Viewed 4441 times
User avatar
6B4G
KT88
 
Posts: 287
Joined: Sun Jul 06, 2008 1:02 pm
Location: Greece

Re: KT66SE

Postby kheper » Sun Oct 06, 2013 1:14 pm

6B4G wrote:
azazello wrote:If You wants decrease +U to 100v, You must change 47 ohm to about 800 ohm/50W =:o and You will have really Oven....
Also grid resistors 12 kohm ....to 1 kohm
Both plates are shorted!



Well winter is nearly here and petrol is expensive so I can use it as a heater.........LOL


My rough estimate to drop ~100V with ~80ma current is that you'll need a 1250ohm/35W resistor.
User avatar
kheper
KT88
 
Posts: 1252
Joined: Wed Dec 21, 2005 10:14 pm
Location: Philly, PA

Re: KT66SE

Postby azazello » Sun Oct 06, 2013 1:16 pm

Yes. /but still both plates are shorted!/
Projects: OTL 6AS7 Gen, Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, headphone ampl. OTL Loftin White 6AS7 RCA....SE E84L&E80CC Siemens&Tel-n.
User avatar
azazello
KT88
 
Posts: 285
Joined: Tue Nov 10, 2009 8:24 am
Location: Bulgaria - EU

Re: KT66SE

Postby 6B4G » Sun Oct 06, 2013 1:19 pm

Sorry this should be better.
Attachments
kt66 schem.gif
kt66 schem.gif (31.76 KiB) Viewed 4439 times
User avatar
6B4G
KT88
 
Posts: 287
Joined: Sun Jul 06, 2008 1:02 pm
Location: Greece

Re: KT66SE

Postby azazello » Sun Oct 06, 2013 1:23 pm

kheper wrote:
6B4G wrote:
azazello wrote:If You wants decrease +U to 100v, You must change 47 ohm to about 800 ohm/50W =:o and You will have really Oven....
Also grid resistors 12 kohm ....to 1 kohm
Both plates are shorted!



Well winter is nearly here and petrol is expensive so I can use it as a heater.........LOL


My rough estimate to drop ~100V with ~80ma current is that you'll need a 1250ohm/35W resistor.

All Your current for both channels is about 160 ma....Power of resistor must be 2-3 time more than counting...Grid res. of EF184 must be 1 kohm.
Projects: OTL 6AS7 Gen, Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, headphone ampl. OTL Loftin White 6AS7 RCA....SE E84L&E80CC Siemens&Tel-n.
User avatar
azazello
KT88
 
Posts: 285
Joined: Tue Nov 10, 2009 8:24 am
Location: Bulgaria - EU

Re: KT66SE

Postby kheper » Sun Oct 06, 2013 1:24 pm

I'd go with a 100ohm carbon resistor strapped from the screen to the plate of the EF184 or get a real triode.
User avatar
kheper
KT88
 
Posts: 1252
Joined: Wed Dec 21, 2005 10:14 pm
Location: Philly, PA

Re: KT66SE

Postby kheper » Sun Oct 06, 2013 1:31 pm

azazello wrote:
kheper wrote:My rough estimate to drop ~100V with ~80ma current is that you'll need a 1250ohm/35W resistor.

All Your current for both channels is about 160 ma....Power of resistor must be 2-3 time more than counting...Grid res. of EF184 must be 1 kohm.


Good catch. For some reason, I thought he was building mono-blocks.

100 / .160 = 625ohm

400 * .160 = 64W
Last edited by kheper on Sun Oct 06, 2013 1:32 pm, edited 1 time in total.
User avatar
kheper
KT88
 
Posts: 1252
Joined: Wed Dec 21, 2005 10:14 pm
Location: Philly, PA

Re: KT66SE

Postby 6B4G » Sun Oct 06, 2013 1:31 pm

Due to it being a new build there are many options that can be made. It is not necessary for me to use the EF184 I can use anything as I have lots of tubes to use.
You guys seem to know your stuff quite well and I'm absorbing the knowledge.
Attachments
kt66 schem.gif
kt66 schem.gif (31.75 KiB) Viewed 4436 times
User avatar
6B4G
KT88
 
Posts: 287
Joined: Sun Jul 06, 2008 1:02 pm
Location: Greece

Re: KT66SE

Postby 6B4G » Sun Oct 06, 2013 1:33 pm

Why would I put a 10K pot?
I will be using a preamp.
User avatar
6B4G
KT88
 
Posts: 287
Joined: Sun Jul 06, 2008 1:02 pm
Location: Greece

Re: KT66SE

Postby azazello » Sun Oct 06, 2013 1:47 pm

This schematic is enough to direct switch to input CD, DVD, receiver, Cassette deck, Iphone, CDman, RIAA....
What kind of pretubes You have?
Projects: OTL 6AS7 Gen, Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, headphone ampl. OTL Loftin White 6AS7 RCA....SE E84L&E80CC Siemens&Tel-n.
User avatar
azazello
KT88
 
Posts: 285
Joined: Tue Nov 10, 2009 8:24 am
Location: Bulgaria - EU

Re: KT66SE

Postby 6B4G » Sun Oct 06, 2013 2:01 pm

ECC83
12ax7
12au7
ECC81
12AY7
12B4A
EF86
CV4003
6DJ8
6SN7
6SL7
12SN7
User avatar
6B4G
KT88
 
Posts: 287
Joined: Sun Jul 06, 2008 1:02 pm
Location: Greece

PreviousNext

Return to tube 101

Who is online

Users browsing this forum: No registered users and 15 guests