Session_sg75_schematic_instructions 电路图 维修原理图.pdf

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1、First designed in 1980, the Sessionette was Sessions first transistor amplifier. It is quite small, roughly the size of a 14” TV and is very loud at 76 watts RMS into a very efficient Celestion G12K 85 100dB speaker and soon gained the reputation of the British Boogie before long, but, was only 199.

2、00 when first launched onto the market in April 1981. Over its life span, it was available in 1x12”, 2x10”, 2x12” and 1x15” formats. Today, the 2x12” version is the most sought after and has become known as “.a Bluesbreaker on steroids” because of its remarkable tonal similarity to that amplifier, b

3、ut with much more overdrive and loudness. It is a dual channel switching combo and is believed to be the first amp of its type with two distinctly separate channels that could be independently set up for different sounds. At that time, Mesa Boogie amplifiers were still dual channels with an A/B box

4、to select between the clean and distortion sounds. It has a single input, a common three band passive EQ of the passive bridged T design and a single main volume control for each channel. There is not a Master Volume. The overdrive Channel A has a gain control to set the depth of the distortion and

5、a Filter control, which is a kind of Tone and operated post distortion. The common three band EQ operated on both channels and was situated pre-distortion with respect to the overdrive channel. However, the EQ Bypass switch on Channel A, enabled the EQ circuit to be bypassed with a flattish response

6、 providing a tonality similar to the Normal channel of a Vox AC30. This enabled the whole range of early guitar amp sounds to be found like. the solo on Rock around the clock and other rock-a-billy sounds. The EQ Bypass tone found favour with many players and became a very strong feature of that amp

7、. The preamp was loaded with four TL072 and one TL071 BiFet operational amplifiers (op-amps). We think this was the first amplifier to use, what was, this very new kind of op- amp. It enables very high input impedances and also very low noise performance. Both crucial to guitar amplification. It is

8、provided with an extension speaker socket, headphone output, effects send and return (0dB) and a monitor output (post FX) to send your guitar sound to other amplifiers. A channel and reverb foot switch was provided with the amplifier. Geoff Whitehorn was the first player to use them and acted as our

9、 tester. He used a pair of 1x12”s on Billy Oceans hit Lover Boy, where Geoff played a Van Halen style solo. great stuff! It was used on many hit records of the day, including This ol House - Shakey Stevens, 2 4 6 8 Motorway - Tom Robinson, most of those by Big Country and The Eurythmics. too many to

10、 list here. Our big heroes, Jan Ackerman and the late Roy Buchanan are two musicians we are very proud to be associated with. Award-Session, 34 Belvedere, Basingstoke, RG24 8GB, UK Tel. +44 1256 477 222 - Email. infoaward- Tony Hicks The Hollies c1985 Jan Ackerman Focus c1985 The Sessionette:75 Comb

11、o Model #: SG75-112, 212, 210 & 115. From April 1981 to October 1988 收音机爱好者资料库 Ra d i o Fa n s .CN 收音机爱好者资料库 Ra d i o Fa n s .CN 收音机爱好者资料库 Ra d i o Fa n s .CN HY200, HY248, AX120P or BP120P 34 Belvedere, Basingstoke, RG24 8GB, UK International Tel. +44 1256 477 222 : UK Tel. 01256 477 222 email. inf

12、oaward- or award-sessionradius-intl.demon.co.uk REPLACING A POWER MODULE IN A SESSIONETTE:75 GUITAR OR SESSIONETTE:100 BASS AMPLIFIER The following applies to all 1980s models from January 2003 The procedure is quite simple and the accompanying photos should make everything self explanatory. The mod

13、ule supplied is a modified PCB which is fitted to our current amplifier range. We had to discontinue the original version simply because they have run out and the demand for them is now too small to re-make them. You will need to frill two (2nr) new M4 holes in the chassis to mount the module. For t

14、idyness, please fit the old screws in the original holes now left vacant (empty). Please remember to apply thermal heat transfer paste between the heat transfer braket and the chassis. Without it, the power module will overheat and burn out the power transistors. We recommend that this is fitted by

15、a qualified technician. Make sure the connections are correct before turning on the power! The cost of the PM120 Power Module is: 29.95 plus 3.00 P&P UK 29.95 plus 5.00 P&P Continental Europe (Approx: 52.50 Euros) We accept: Switch, Solo, Visa & MasterCard Please phone your order or. .you can send your credit card number split across two emails. Email is not secure!