Hi all, I am currently restoring a Marantz 2215b as my first restoration. I am working on the power amp and I am having trouble sourcing a suitable replacement transistor for H709 and H710. The originals were 2SA684 which folks have said to substitute with KSA1220AY. However KSA1220AY is out of...
This amp was coughing up occasional hairballs of noise/static. Noise was coming from the power amp, and this was after a full re-cap and replacement of some other questionable transistors.
In an attempt to fix the noise, I replaced Q605 and Q606, which were 2SA912, with KSA1013. Now I'm stuck...
I'm trying to eliminate the last few gremlins in this Rotel. It crackles a bit and I've read that KSA912 gets noisy (and hot) so I'd like to replace Q605 and Q606 on the main amp board, which are listed as "main amp bias compensator". KSA1013 seems to be the go-to sub, but I don't have any on...
Hi,
I want to replace transistors 2SC1061 and 2SC1162 in a Braun Regie 350. These are the subs I'm considering:
2SC1061 -> MJE15034G
2SC1162 -> KSD794AYSTU
I'm confident that the MJE15034G is a good sub, but I have no idea about the KSD794. It all seems fine, but the ft is way off. Then...
"Title EDIT" Boards are F-1159, Not F-1231
So Transistors are something I have not learned much about. And when the fail on the tip of a hat. I just don't know what to do about it...... Lol. "I'M BLIND!"
Anyway, this Sansui Au-666 worked a few years ago. Sounded wonderful! So good infact, I...
Hi Folks,
Got a McCormack DNA-500 that had a "firecracker effect" failure (POP! Bang, bang, bagitty-bang, bang from the output to input). Gonna use NJW3281/1302 on the outs for the C3281/A1302, but coming up dry on the MOSFET's. Don't trust the SOA (often not listed) for the in-production...
I want to replace the 2sc2878 transistors in my Yamaha AX-390 amplifier’s tone controls, as there is an audible hiss through the speakers and headphone jack, which increases/decreases in intensity as I boost/cut the treble using the knob.
So far I’ve uses the Toshiba 2sc2878 datasheet and...
Correction. It's a Kenwood KR-4070. I don't know how to edit the title!!
Q1-Q4 semiconductors in the power amp section, are supposed to be either 2SA640E or F or 2SA841 (GR or BL) according to the Kenwood repair manual and specs. The previous owner has installed PN4249 even though the leg...
Hi all
I know there was some work done on this before, by many, and much greater minds than I.
I thought it would be a good idea to get people to list their gear and the specific modern replacement they used when replacing worn out or dodgy relays.
I recently replaced relay in an Onkyo A7090...
Hi,
I'm posting the question here as it's prurely related to solid state circuitry and not tape itself.
I'm repairing an old Akai GX-600D PRO (2 track) recorder.
The schematic below shows a 2SD360 NPN transistor right after the diode bridge. This transistor was replaced by a TIP42B (same...
Is KSA916Y a good choice for replacing 2sa915 on KA-7100 Bias circuit (Qe7-10)? Other suggestions? Trying my best here, but I want to double check with anyone who has replaced these before. Funny it's so hard to find with so many recaps of this great amp. One thread said KSA992's were too...
Anybody knows of a good quality substitute for the Ortofon OM-30 or OM-20 stylus?
Trying to upgrade the needle that originally came with the Concord Pro S – I'd like to get more detail, wider soundstage, more clarity... (it's for a Technics TT).
Any experiences in terms of reliability and...
Hi
I recently bought a PL400 needing attention. One channel has original drivers and outputs (RCA 410 and XPL909). The other channel has some different components - Drivers are SJ2741 and the outputs are a mix of four PL909 and two MJ15024 - not good.
Arrived with no main fuse. On DBT (with...
I cannot find a thread of this nowhere in the whole internet!
I have recently purchased a Marantz DV7600 DVD SACD. It is working perfectly but it did not come with its remote. As this is a older model from 2007, I cannot find its corresponding remote "RC7600".
In ebay or other similar sites I...
Hello all.
These 48vdc relays are used to drop the output of the Driver Amps from reaching connected speakers during a fault condition. The two in my A-9 operate, i.e. armature operates but no output to speaker connections.
Now these are not available under there Pioneer nomenclature, and a...