DHT OTL Linestage - Tram 2 - Page 94 - diyAudio
Go Back   Home > Forums > Commercial Sector > Vendor Forums > DIY HiFi Supply

DIY HiFi Supply Parts and Kits from Diy HiFi Supply

Reply
 
Thread Tools Search this Thread
Old 19th February 2014, 06:32 AM   #931
bronal is offline bronal  Australia
diyAudio Member
 
Join Date: Apr 2011
Location: Canberra
Default WTB: Tram 2

I'd like to acquire another 220/230v Tram, with or without mods. Preferably set up for 45s. Must be in 100% working order and in excellent cosmetic condition. Even better would be an unbuilt kit. Please PM me if you have something.
  Reply With Quote
Old 2nd May 2014, 10:19 AM   #932
rab28 is offline rab28  Australia
diyAudio Member
 
Join Date: Jan 2010
Location: Melbourne
Quote:
Originally Posted by kazap View Post
I have the Marantz remote RC5200SR. It works selecting the TUNER function. For coding select any Marantz AV Receiver eg SR-7200 or SR-4200 should work and are in the Logitech database. Enjoy.
Hi all, for the record i finally sat down and tried several different amplifier and AV receiver brands and models to get the input selector working.

The SR-7200 does not work, but the SR-4200 AV receiver does! So now for the first time I have both volume AND input selector working! (I could not get any of the Rotel, Philips or Marantz amplifiers remote codes to do this).

Thanks kazap!
  Reply With Quote
Old 5th July 2014, 10:40 AM   #933
diyAudio Member
 
Join Date: Oct 2006
Location: Karalee, Queensland
On Morten's Tram2 Rod Coleman power Supply picture, he has two resistors per side for R1 and R2. Does anyone has the ohm values for each resistor and are they in series or parallel. Morten said he is using 0.15 ohm resistor for R1 and R2.

Any thoughts.

Thanks

Peter
  Reply With Quote
Old 5th July 2014, 12:22 PM   #934
работник
diyAudio Member
 
Rod Coleman's Avatar
 
Join Date: Jul 2004
Location: Warwickshire UK
hello Peter,

I assume you mean the R1 and R2 in the raw-dc supply that feeds the regulator (and not R1/2 of the regulator PCB itself).

0.15 sounds OK as a start, but the only thing we care about is to get the dc voltage supplied to the Regulator at about 7.5V-7.7V (measured at the regulator PCB).

You can increase from 0.15, if the voltage is too high (which will burn more heat is the regulator pass transistor) or adjust lower for more voltage.

The resistors can be equal or different values.
  Reply With Quote
Old 6th July 2014, 01:11 AM   #935
diyAudio Member
 
Join Date: Oct 2006
Location: Karalee, Queensland
Rod,

Thanks for your response. Yes, I am talking about the raw-dc supply. I am after the configuration for these two resistors. On Morten's picture, there are two resistors for R1 and two resistors for R2. What would you recommend using for example: 'say one resistor for R1 at 0.15 ohm at 10 watt'. Thanks

Peter
Attached Images
File Type: jpg IMG_4137_2.jpg (165.5 KB, 76 views)
  Reply With Quote
Old 6th July 2014, 06:53 AM   #936
работник
diyAudio Member
 
Rod Coleman's Avatar
 
Join Date: Jul 2004
Location: Warwickshire UK
If you are using the 7.5V winding on the TRAM2, then the values that Morten used should be your starting point, so yes, R1=R2= 0.15 10W wirewound.

When you have built and installed the Regulator and raw dc, please measure the raw dc's voltage at the Regulator PCB, when it is adjusted so that the 2A3 filaments have 2.5V across them. The volage must be 7.5-7.7V on a TRAM. if it is outside this range, reduce R1 to increase voltage, or decrease R1 to get a lower raw dc voltage.

One can't predict the exact value of resistor, because it depends upon the small resistances (parasitics) of the rectifiers, ESR of caps, trafo, wiring.
BUT - it's only with a 2A3 that so much fuss is called for: with 45, or other lower current filaments, the raw dc can be anywhere from 7.0-8.2V
  Reply With Quote
Old 6th July 2014, 07:24 AM   #937
diyAudio Member
 
Join Date: Oct 2006
Location: Karalee, Queensland
Rod,

Thanks for your info.

On the Regulator PCB, Morten used a 0.47 ohm 2 watt Mills resistor for R1 for his 2A3 tube. I am using 45 tubes. Will this 0.47 ohm resistor be ok for the 45 tube???, or if not what should I use.

Just to clarify on my previous question, I only need to use one 0.15 ohm 10 watt resistor for R1 and the same for R2. I just wondered why Morten has two 0.15 ohm resistors for R1 and the same for R2.

Thanks
  Reply With Quote
Old 6th July 2014, 08:19 AM   #938
diyAudio Member
 
Join Date: Jan 2005
Location: a littlee town in western denmark
Hello
I can se on the skematic from Rod, that you shall use one 0.68ohm on the regulator

a good idea is to buy some different resistor value for the input to coleman regulator--
i use 0.18 ohm (2 pieces like Morten)--it depent on what is the volt from net ..here by me in Denmark i have 232 v ---maybe you have 240 or 220v
Best Bjarne
  Reply With Quote
Old 6th July 2014, 08:51 AM   #939
diyAudio Member
 
Join Date: Oct 2006
Location: Karalee, Queensland
Bjarne,

Thanks for your input. Australia voltage is 240 volts. I have two large resistors on each black 0 Volt wire on the Tram2 power transformer to drop the voltage for the heater circuit. All other voltages are ok.

Peter
  Reply With Quote
Old 6th July 2014, 11:45 AM   #940
работник
diyAudio Member
 
Rod Coleman's Avatar
 
Join Date: Jul 2004
Location: Warwickshire UK
Peter, Yes, Bjarne's advice is good. Buy as few cheap 10W ceramic wirewound resistors 0.1 to 0.68, to fine tune the raw dc voltage.

If you want to use a 45 only, and 240V mains, you may need R1=R2=0.47 as a starting point.

Then if you need more voltage, drop one of them to 0.33. For lower voltage, raise one to 0.68 (or just add another 0.1 in series).

If you have it all connected now, what is the raw dc measuring?
  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
C3M linestage costa23 Tubes / Valves 15 23rd August 2009 08:53 AM
C3m linestage bequerel Tubes / Valves 32 14th April 2009 06:03 AM
48V B+ linestage hirafu_boarder Tubes / Valves 24 11th May 2008 05:57 PM
Another linestage...... kianbach Tubes / Valves 11 28th June 2005 05:34 PM
:: linestage [Bryston B60] :: dhengkoel Solid State 6 26th September 2002 03:32 PM


New To Site? Need Help?

All times are GMT. The time now is 01:49 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