Yes almost all listed in the BOM are 0.5W resistors. They could be 0.25W also except R10. RZJ could be 1W, if ever used instead of a wire link to artificially augment the HP output impedance (dropping the damping factor for coloring warmer any dry cans). Because it will share some power with the cans.
Good ones are also the KOA Speer MF series. Not too expensive.
I have used Vishay Beyschlag MBB and MRS series for R1. You can parallel upto 3 on these boards. Since these are 0.6w each you can make 1.8w with three of them or 1.2w with two in parallel. 50ppm and inexpensive.
nash
If you guys are willing to use single but the exact (or very close) values and do not mind to use bit excessive power rating, then partsconnexion still sale MRA-5s. They are the bests for such positions, but unfortunately they are not cheap.
Mills MRA-5 Resistors
Mills MRA-5 Resistors
I have come across some CFs which are magnetic and some that are not
On the other side I have yet to come across a magnetic RN.
Mouser have a good stock of high quality 1W/2W resistors, most other places don't.
For Europe Hificollective has some 2W Kiwame, 1W PRP (both 10R +) and 1W Takman metal films (2R2+). For America PartConnexion has more variety of audio resistors.
My preference is CFP series for their relative small size and good specs. Welwyn W21 (3W) has also compact size (Farnell has them)
DCG3 / FSP / UFSP has some limitations for power resistors size but BIB / UBIB are more flexible so 3W/5W can be used.
:
That explains it, now it makes sense
. Anyway, psu makes difference, hell, diodes and filter caps make difference. You have a nice pre (6V6) to compare to. Not far to go now.
fire it up.....no problem at all.
10Ω=1.406V after matched DN2540
10Ω=1.396V after matced DN2540
On 220Ω bias bf256b 905mv about 4.2ma
On 220Ω bias bf256b 915mv
i have a quad chinese 2sk170 bl after ignition shows me 45mv each channel ,after two minutes goes to 2-3mv each channel . about 5-6Ω + on trimmer add.
with opamp opa2134 1-2mv ....
34 C on heatsink Ubib and 33 C on heatsink DCG3.
10Ω=1.406V after matched DN2540
10Ω=1.396V after matced DN2540
On 220Ω bias bf256b 905mv about 4.2ma
On 220Ω bias bf256b 915mv
i have a quad chinese 2sk170 bl after ignition shows me 45mv each channel ,after two minutes goes to 2-3mv each channel . about 5-6Ω + on trimmer add.
with opamp opa2134 1-2mv ....
34 C on heatsink Ubib and 33 C on heatsink DCG3.
Attachments
Last edited:
That explains it, now it makes sense
Σαββα i will do it , Nick told me the DCG3 it is a diffrent story ..... will see..
Are you sure they are not fakes? What make are they?
The NEC ones are made in Japan and look a bit different.