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by pre65
Thu Aug 30, 2007 10:30 pm
Forum: Assorted Stuff
Topic: Leak Stereo Twenty
Replies: 7
Views: 9017

And this may be of interest as well

http://www.werple.net.au/~kiewavly/transformers.html
by pre65
Thu Aug 30, 2007 10:27 pm
Forum: Assorted Stuff
Topic: Leak Stereo Twenty
Replies: 7
Views: 9017

Hi Andrew-another amp ?

This may be of interest to you

http://www.geocities.com/stereo20/home.html

Are there any markings on the old transformer ?
by pre65
Thu Aug 30, 2007 4:05 pm
Forum: Assorted Stuff
Topic: Audio Jumble, Kent.
Replies: 16
Views: 13084

BUM !!!

I wanted to go there but i am racing in Northampton on Sunday.
by pre65
Thu Aug 30, 2007 1:59 pm
Forum: Everyones Projects
Topic: DTBs 6B4G
Replies: 361
Views: 224383

Hi-yes its in the old goods yard at Chappel and Wakes Colne station.The station is on the Marks Tey _ Sudbury branch line which is still in use but it is also the location of the local railway preservation society and they do indeed have steam choo-choos on site. Never been myself but it has a good ...
by pre65
Thu Aug 30, 2007 1:37 pm
Forum: Everyones Projects
Topic: DTBs 6B4G
Replies: 361
Views: 224383

Hi Dave-your parcel has been posted.

Went to Sudbury main post office,and on market day (busiest day of the week) only 3 of 7 positions were manned !

People queuing outside on the pavement !

Please be careful with the ale fests,we dont want you falling over and damaging more body parts :lol:
by pre65
Thu Aug 30, 2007 10:29 am
Forum: Everyones Projects
Topic: DTBs 6B4G
Replies: 361
Views: 224383

Hi Dave-who is Deb ?

Have you got a wooman in your workshop ?

Looks like she needs some edukashion !
by pre65
Wed Aug 29, 2007 9:52 pm
Forum: Beginners
Topic: Regulator heatsink
Replies: 29
Views: 24472

Hi-my PSU designer wont accept 1N5820 so i have got some others coming,

IR50SQ100 100V @5A.

Might as well try and get it done proper like.
by pre65
Wed Aug 29, 2007 6:31 pm
Forum: Everyones Projects
Topic: DTBs 6B4G
Replies: 361
Views: 224383

Hi Dave-i have a couple of spare C3g,do you want to borrow one till you get a replacement ?

I can put it in with the step ups !

No hurry for the replacement.

EDIT.i am doing your parcel now so i will put the C3g in anyway.
by pre65
Wed Aug 29, 2007 4:42 pm
Forum: Beginners
Topic: Regulator heatsink
Replies: 29
Views: 24472

pre65 wrote:
Just checked my parts box and i have 16 1N5820 which seem to be 20V 3A schottky diodes-will those be better ?


Hi-will these schottky diodes be man enough ?
by pre65
Wed Aug 29, 2007 1:47 pm
Forum: Beginners
Topic: Regulator heatsink
Replies: 29
Views: 24472

Hi Nick-the transformer says its 50VA with twin secondarys (i will connect both secondarys together in parallel)-one transformer for each PT15. Cant measure the cap DCR cos its on a tagboard and wired up ! Just checked my parts box and i have 16 1N5820 which seem to be 20V 3A schottky diodes-will th...
by pre65
Wed Aug 29, 2007 12:57 pm
Forum: Beginners
Topic: Regulator heatsink
Replies: 29
Views: 24472

Hi Nick-i am using 4 UF5401 diodes to rectify the 9V AC. Hi DTB-i have put together a Bluebell order for the remaining parts i need for the PT15 (resistors,caps,knobs) so i have added my Phono3s resistors to that order . I should be ready to order in a day or so. Thanks for the offer but i will wait...
by pre65
Wed Aug 29, 2007 12:24 pm
Forum: Beginners
Topic: Regulator heatsink
Replies: 29
Views: 24472

Hi Nick-thanks very much for those calculations.

In my head it sort of looked right ! :)

I will add some 1R 12W resistors to my Bluebell order.
by pre65
Wed Aug 29, 2007 11:45 am
Forum: Beginners
Topic: Regulator heatsink
Replies: 29
Views: 24472

Hi Nick-i am using the circuit you posted on the WD forum

9v toroid
LM338T regulator
1R5 6W sense resistor
6v (or 6.3V) filament in PT15
1.5A filament current
1K variable pot
by pre65
Wed Aug 29, 2007 11:24 am
Forum: Beginners
Topic: Regulator heatsink
Replies: 29
Views: 24472

Regulator heatsink

Hi-i am new to working with regulators and i would like some advice on whether the heatsink i have made for the regulator on my PT15 heater supply is good enough before i bolt it all together. The reg is mounted on a purpose built heatsink which is mounted on a piece of alloy angle 6"long X 1.5...
by pre65
Tue Aug 28, 2007 5:23 pm
Forum: Valves
Topic: Graaf GM20 schematic
Replies: 2
Views: 6806

Graaf GM20 schematic

Hi-i asked this question on the "other" forum some time ago without success but has anyone got a copy of the Graaf GM20 amp circuit WITH component values ? Has anyone ever had a chance to compare them with "other" valve amps ? It seems "Dr" John Caswell is a fan of them.