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Cherry 180 / Black beauty 305

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MRHP

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TFM-75

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Joined: Wed Jan 18, 2012 2:36 pm

Location: Buzzard Creek Ky

Post Wed Mar 06, 2013 9:39 am

Cherry 180 / Black beauty 305

Pardon my tube amp ignorance but I want to know what is the purpose of the small tubes and what type are they...as in 12AX7 etc etc.
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radioeng2

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Post Wed Mar 06, 2013 10:22 am

Re: Cherry 180 / Black beauty 305

Someone else will have to answer more specifically.

But the typical tube amp (if there is such a thing) wil have an input tube that acts as a voltage gain stage first.

Then if it's a push-pull design, there will be a phase splitter stage. This splits the signal into the positive going signal on one side and the negative side of the waveform routed to the other side. There are several styles of phase splitter stages, it could be one tube or two.

Typical tubes used, like all the Dynaco and follow ups to them, often use tubes like the AX in the voltage gain and the AU in the phase splitter.

One additional small tube that Bob uses in many of these is a small signal rectifier tube. It's in the output tube stage and is used in the bias circuit. If I remember right, it might be a 6AL5.

Maybe somebody else can be more specific about the models your asking about, Eric. I think they may have been some version of a schematic around here somewhere.

Mark
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elgrau

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Post Wed Mar 06, 2013 1:11 pm

Re: Cherry 180 / Black beauty 305

MRHP, I'd recommend that you pick up this book (from Amazon or eBay..): "Elements of Radio" by A. Marcus and W. Marcus. It's old, but unique in that the 1st half of the book goes into the "evolution" of tube amplification and how all these "little tubes" came into play into the circuit of an audio frequency amp (and "radio detector", RF amps, etc.). Probably not all of Bob's "tricks" are covered, but the basic reasons for the "little tubes" pretty much is... Has an entire chapter on all the different types of tubes and their function. NOT a bunch of data and statistics on each; just the how and why of the different types. Also covers power tubes in // and push-pull. The 2nd half of the book delves into the math and science part of circuit elements, magnetism, electricity, etc., but they try and keep the 1st half more "words" and common sense oriented....
Family room: 400 disk changer with PS Audio Digital Link III DAC; Technics SL-1100A TT. QED Quenx1 IC's from DAC & TT to Adcom GTP-602 preamp/Tuner. AudioQuest King Cobra IC's from preamp to M1.0t mk-II opt2. QED Silver Spirals 4M wires to EPI 1000’s.
Living room: AudioQuest Black Mamba 8M IC's from family room preamp to Barcus-Berry 2002R Sonic Maximizer to GlowPower Zyxt IC's to Sunfire 300x2 to Nordost 6M bi-source wires to AOS 28" MDF spherical speakers using six 8" woofers and eight 1" dome tweeters symm. arranged around the surface.
SS system: CX-995V DVD to AV-705x 5 channel amp (center/rears) & M1.0t mk-II opt2(fronts).
Garage: TLM-3600 CDP to MXR150 Receiver (pre) to TFM-42 to EPI 400 speakers.
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thuffman03

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Post Wed Mar 06, 2013 4:33 pm

Re: Cherry 180 / Black beauty 305

The three small tubes are:

12AX7
12AT7
6AL5

The 12AX7 and the 12AT7 are input driver tubes
The 6AL5 is for BIAS

This is taken from the owners manual:

The input stage of these amplifiers consists of a 12AX7 current sourced, long-tailed balanced pair direct coupled to a second long-tailed balanced pair comprised of a 12AT7. The 12AT7 drives the grids of the output tubes through a pair of coupling capacitors that provide low frequency loop-gain stability. A 6AL5 DC restorer ensures that the bias voltage remains correct over the entire audio signal cycle.
Some cool Carver stuff!
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MRHP

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TFM-75

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Joined: Wed Jan 18, 2012 2:36 pm

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Post Wed Mar 06, 2013 6:53 pm

Re: Cherry 180 / Black beauty 305

Thanks to everybody.
TFM-75 serial #0001
PT-2400 serial #0001
Baby Black serial #0001
Baby Black serial #0002
Bone Stock Lightstar
Vintage Hi-Fi modified Lightstar
Cherry/260's
Carver 490t
Sunfire Tube preamp
ProJect TT Tube preamp
DENON DP-62L TurnTable
DQ-20's
Douglas Cables
More Douglas cables
OK ERIC, LET GO OF THE MOUSE AND BACK AWAY FROM YOUR PC WITH YOUR HANDS IN THE AIR. NOW SLOWLY LAY FACE DOWN ON THE FLOOR!!!! - Snoop65

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