Note: The DCA55 gave readings from the removed 2SC458's ranging from Hfe = 75 to 313 - all of which are well below the new Fairchild KSC1845's. Would someone assist me by explaining how to get the best matches for the two channels. The constants: Ic is 2.5mA, Vbe is 0.74v, Ib is 4.66 and Ic is 0.00. These KSC's, though new, show the Hfe readings range from 403 down to 339. and have a new PEAK DCA55 meter to help me. (Board: No.TH50001A as shown on the solder side) I have 60 Fairchild KSC1845's to choose from. My GX635D is on the bench with all 2SC458 transistors removed from both Left and Right channels in the Pre-amp. Thank you in advance for any advice you may have. A head not-alignment it’s also questionable since the tape plays great in both direct and reverse mode when it’s NOT flipped. The same preamps are being used to play the tape in direct mode, reverse mode, regardless if you flip it or not. This is very strange, why such in-balance when I flip the tape while it’s playing perfectly if the tape it’s not flipped. Same happens when I play the (flipped) tape in Reverse mode except that now, the right channel is higher and the left channel is lower. However, if I FLIP the tape and play it again, the left channel is now playing about 20dB less than the level it was recorded at and the right channel is playing about 10dB higher than the level it was recorded at. If I playback the tape in the same order as it was recorded (play in direct mode and reverse mode), it plays great, both channels are equal, in both directions, just the way they have been recorded. I record a brand new tape, heads perfectly clean, both channels recorded equal it’s all good. Hello All, my Akai 635D is behaving very strange. Yes, I bought a new amp, TT, EQ, speakers.you only live once. Īt the end of the day, it is your dream and it sounds thirty-something times better than anything you've ever heard. ya all know the story.Īnd then, you realize you can get your dream back and.you realize it's not just the sound (surely, someone's gonna interject saying their whatever-brand R2R sounds better over 16Khz or. It doesn't matter(!)- AT ALL-! It's a dream and, regardless of it being' a money pit, I am re-living it, thirty-something years laterīeing a teenager, I saw it playing Tales from topographic oceans. Most likely, not the cheapest (considering I had to ship it from Japan and pay ScoMo's f'g taxes). I haven't done much recording w/my 760D or 740D decks yet, but I can say that the GX-F80 makes excellent sounding tapes with just some humble Type I Maxell UR tapes - better than just about any pre-recorded tape I have.(and I have a bunch of good sounding ones).This one's not about how good the heads are or how clean or cheap I got it nothing of that sort. The fact is that cassette deck technology improved throughout the 80's, but there was certainly some very nice stuff from the late 70's too. I guess it just comes down to what you're looking for in a deck/how bad you need metal/Type 4 tape compatibility. Also, while I don't have experience w/the GX-95/75, I do have some GX-F80s - and they're a heck of a lot easier to work on than the GXC-760D or 740D IMO. I actually think I find the GXC family of decks to be a bit more "musical" sounding/slightly warmer than the following generations w/the Super GX heads - but they're very similar, and I think the Super GX head decks have a bit more detail/accuracy to the sound. You will get better performance on paper out of the later models (i.e - less W&F, less THD, metal tape compatibility), but sometimes the numbers don't tell the whole story on how a deck sounds in my experience. Love it's tank-like build quality (weighs a good 25 lbs or so), musical sound, and looks (colored light transport buttons and analog VU meters = ). No experience w/the Akai GX-95 or 75 (Or Yamaha decks), but I'm quite fond of the GXC-760D (I own one).
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